This standard specifies the scheme and procedure for sampling inspection of electrodeposited metal coatings by counting. This standard is applicable to the inspection of final products, parts and inventory (but not limited to these scopes). It is mainly used for the inspection of continuous batches, and can also be used for the inspection of isolated batches. However, the guarantee provided for isolated batches is lower than that provided for continuous batches. With the agreement of both the supplier and the buyer, this standard is also applicable to the inspection of relevant finishing. This standard does not apply to the sampling and testing of fasteners with electrodeposited metal coatings and relevant finishing. The sampling scheme given in this standard is based on the qualified quality level of 1.5% and 4.0%. GB/T 12609-1990 Sampling inspection procedure for electrodeposited metal coatings and relevant finishing GB/T12609-1990 Standard download decompression password: www.bzxz.net
This standard specifies the scheme and procedure for sampling inspection of electrodeposited metal coatings by counting. This standard is applicable to the inspection of final products, parts and inventory (but not limited to these scopes). It is mainly used for the inspection of continuous batches, and can also be used for the inspection of isolated batches. However, the assurance provided for isolated batches is lower than that provided for continuous batches. With the agreement of both the supplier and the buyer, this standard also applies to the inspection of relevant finishing. This standard does not apply to the sampling and testing of fasteners with electrodeposited metal coatings and relevant finishing. The sampling plan given in this standard is based on the qualified quality levels of 1.5% and 4.0%.

National Standard of the People's Republic of China
Electrodeposited metallic coatings and related finishes
Sampling procedures for inspection by attributes
Electrodeposited metallic caatinge and related finishes....Sampling procedures for inspection by attributes This standard is equivalent to the international standard 1504519 Electrodeposited metallic coatings and related finishes. 1 Subject content and scope of application
1.1 This standard specifies the sampling inspection plan and procedures for electrodeposited metallic coatings. GB 12609—90
Sampling inspection procedures by attributes",
1.2 This standard applies to the inspection of final products, special parts and inventory (but not limited to these scopes), mainly used for the inspection of continuous batches, and can also be used for the inspection of isolated batches. However, the guarantee provided for isolated batches is lower than that provided for continuous batches. 1.3 With the agreement of both the supplier and the buyer, this standard also applies to the inspection of related finishes. 1.4 This standard does not apply to the sampling and testing of fasteners with electro-deposited metal capping layers and related finishes. 1.5 The sampling schemes given in this standard are based on the quality levels of 1.5% and 4.0%: 2 Reference standards
GB 2828
Sampling procedures and sampling equipment for batch-by-batch inspection (applicable to the inspection of consecutive batches) Statistical terms and symbols
GB3358
3 Terminology
3.1 Inspection batch
A group of key-coated products in an inspection batch, which are provided by the same supplier at the same time or approximately at the same time, produced under the same conditions according to the same specifications and submitted for inspection according to the same quality requirements.
3.2 Initial batch
A batch or batches of products produced separately, as well as certain batches in a consecutive submission batch for which the quality control information provided by the previous inspection batches cannot be used. 3.3 Qualified quality level, limit quality, sample, sampling plan, fatal defect, stratified sampling see GB3358.3.4 Continuous batch, judgment array see GD2828.4 Acceptance and rejection
4.1 Responsibility for testing
Unless otherwise specified in the contract or order, the supplier shall be responsible for performing all required tests to check the consistency of the product with the specified requirements. The supplier may use any test equipment suitable for completing the inspection requirements. In order to ensure that the electrodeposited metal coating or related finishing meets the specified requirements, the purchaser has the right to perform any inspection specified in the contract or order when it deems it necessary. The test result report shall be kept for reference for one year from the date the purchaser receives the product. When required in the contract or order, the supplier shall provide the test report.
4.2 Acceptance and Receipt of Lots
Approved by the State Administration of Technical Supervision on December 18, 1990, 1991.1201 for implementation
GB 12609--90
The number of samples for random acceptance shall be equal to the sample size specified in the plan. If the number of non-conforming products found in the sample is equal to or less than the acceptance number, the batch shall be accepted; if the number of non-conforming products is equal to or greater than the rejection number, the batch shall be rejected. 4.3 Non-conforming Products
The purchaser has the right to reject any non-conforming unit product found during the inspection, regardless of whether the product constitutes part of the sample or whether the entire batch is accepted. With the consent of the purchaser, the rejected products may be repaired or corrected in the manner specified by the purchaser and then submitted for inspection again. According to the purchaser's opinion, the supplier may be required to conduct a fatal defect inspection on each unit product. The Purchaser reserves the right to inspect each unit of product submitted by the Supplier for fatal defects and to reject the lot immediately if a fatal defect is found. The Purchaser also reserves the right to sample each lot of product submitted by the Supplier for fatal defects and to reject the lot if a sample taken from any lot contains one or more fatal defects.
4.4* Resubmission of Lots
Rejected lots may be resubmitted for inspection only after all products have been retested or re-inspected and nonconforming products have been removed or defects have been corrected. The Purchaser shall specify in the contract or order whether the re-inspection includes all types or levels of defects or is limited to specific types or levels of defects that were originally rejected.
5 Sampling Method
5.1 The sample shall consist of one or more units of product randomly selected from the inspection lot. The method of random sampling is given in Appendix A (Reference). Nonconforming products shall neither be intentionally included in the sample nor intentionally excluded from the random sample. When selecting samples, the Supplier shall mark all nonconforming products observed for treatment or rework after the inspection. 5.2 Stratified Proportional Random Sampling
In the case of large batches, considering that the quality of products produced by different teams and different production equipment may be quite different, the entire batch of products can be divided into several layers (batches) according to the actual production situation, and the number of samples can be allocated according to the proportion of each layer in the batch, and stratified proportional random sampling can be carried out.
5.3 Sampling Time
Samples can be drawn after the inspection batch is formed, or they can be drawn during the formation of the batch. 6 Sampling acceptance of continuous batches
6.1 This standard specifies two sampling plans of different strictness: normal inspection plan and strict inspection plan. The normal inspection plan is listed in Table 1, Table 2 and Table 3, and the strict inspection plan is listed in Table 4 and Table 5. Unless otherwise required by the purchaser, the normal inspection plan should be used at the beginning of the inspection. 6.2 Sampling for visual inspection, dimensional inspection and all non-destructive tests For unit products produced by non-roll plating method, the visual inspection, dimensional tolerance inspection, non-destructive thickness test and all other non-destructive items shall be sampled according to Table 1 (equivalent to G2828 - General Inspection Level II AQL = 1.5) + Sampling for products produced by roll plating method shall be carried out according to Table 2 (equivalent to GB2828 + Special Inspection S-4, AQL = 4). Unless it can be proved necessary, the samples shall not be prepared separately to replace the products for non-destructive inspection or testing. 6.3 Selection of destructive tests
For a single destructive test, such as hydrogenation, bonding, corrosion resistance, weldability, etc., sampling shall be carried out according to: Table 3 (equivalent to the special inspection level S-2. AQL: -1.5 in GB2828). When the type, shape, size, value of the electroplated parts do not allow for the test specified in the contract or order, or when a destructive test is required for a small number of batches of products, it is allowed to use the same base material and surface state as the plated parts, and the samples plated at the same time as the batch they represent. Unless it can be proved necessary, the test pieces shall not be prepared separately to replace the products for thickness measurement.
6.4 Transfer rules
During normal inspection, if two batches are rejected in five consecutive batches, the sample plan will be transferred to strict inspection from the next batch inspection. 2. If the original table is used, go to Table 4. b. If the original table is used, go to Table 5; GB12609-90. If the original table is used, go to Table 3, the sample size is 20, the acceptance number is 1, and the rejection number is 2. When strict inspection is carried out, if five batches pass the strict inspection in succession, the normal inspection can be restored (i.e., go to the plan shown in Table 1, Table 2, and Table 3). If ten batches are stopped at the strict inspection in succession, the inspection should be stopped before taking measures to improve product quality. 6.5 Alternative sampling plan If a specific sampling plan has been specified in the contract or order, it can be used to replace the plans in Table 1, Table 2 and Table 3. The selection of the type of alternative sampling plan should take into account the following factors: Characteristics of the sampling plan; Difficulty in implementing the sampling plan: Guarantee provided for product quality: d. The amount of work to be checked:
The cost of the inspection,
It should also be noted that the sampling plan suitable for one type of product may not be the best for another type of product. In addition, the supplier's past quality history plays an important role in selecting alternative sampling plans. 7 Sampling acceptance of isolated batches
7.1 Determination of sampling plans for isolated batches
The sampling plans in Tables 1 to 5 are designed for a series of consecutive batches produced over a period of time, and the guarantee of product quality is provided by the transfer rules. If these tables are used for the inspection of isolated batches, it will cause greater risk to the buyer, that is, the buyer is more likely to accept batches of lower quality. If a certain acceptance risk value is given, there is a limit quality (LQ) corresponding to a given acceptable quality level (AQL).
Table 6 lists the limit quality (LQ) values ​​corresponding to the various acceptable quality levels (AQL) used in this standard under a 10% acceptance risk. The LQ value is always greater than the acceptable quality level (AQL) value, and the LQ value is larger for small samples. If the required limit quality LQ for an isolated lot at a 10% acceptance risk is smaller than the limit quality corresponding to the sample size given by the sampling plan found in Table 1 or Table 2, a larger sample size can be selected according to Table 6 according to the selected LQ value. The acceptance and rejection numbers for this sample size are given in Tables 1 and 2. The batches in these tables are not considered at this time.
7.2 Quality assurance of the isolated lot sampling plan for the product The quality assurance of the isolated lot sampling plan for the product is different from the quality assurance provided by the transfer rule in the case of continuous lots. The isolated lot sampling plan corresponds to the limit quality of 10% buyer risk, see Table 6. Table 1 Sampling of products produced by non-barrel plating method (non-destructive ring test) Number of products in batch
Batch size)
91--280
281~500
501-~1 200
20]3 200
# 201~-10 000
10 001 and above
Number of products tested
(Sample size)
Maximum
number of nonconforming products for an acceptable batch
(Number of accepted products)
Minimum
number of nonconforming products for a rejected batch
(Number of rejected products)
Number of products in a batch
Batch size)
151500
5011200
1201~10000
10 001 and above
Number of products in a batch (Batch size)
Number of products tested (Sample base)
GB 1260990
Table 2 Sampling of products produced by the first batch of the melt-plating method (non-destructive test) Number of products tested
(Sample size)
Maximum number of unqualified products in the acceptable batch
(Number of acceptances)
Table 3 Sampling for destructive tests (adhesion, hydrogen embrittlement, corrosion resistance, etc.) Maximum number of unqualified products in the acceptable batch (Number of acceptances) Minimum number of unqualified products in the rejected batch (Number of rejections) Quantity of rejected batch Small
Number of unqualified products
(Number of rejections)
151 or more
Table 4 Stricter sampling inspection of continuous batches of products produced by the non-barrel plating method (non-destructive test)
Number of products in the batch
(Batch size)
91-~500
501~1200
1 201-~3 200
3 201~-10 000
10001 and above
Number of products in the batch
(Batch)
151-~1 200
1 201--10 000
10 001 and above
Number of products tested
(Sample tray)
Maximum number of unqualified products for an acceptable batch
(Number of acceptances]
Table 5 Strict sampling inspection (non-destructive test) for continuous batches produced by barrel plating method
Number of products tested
(Sample size)
Maximum number of unqualified products for an acceptable batch
(Number of Acceptance)
Minimum
Number of Nonconforming Products for Rejected Lot
(Number of Rejection)
Minimum
Number of Nonconforming Products for Rejected Lot
(Number of Rejection)
Sample Book
CB12609---90
Limiting Quality of Isolated Lot Test
Limiting Quality with 1D% Risk for Specified AQL AQL-1.5
Note: (L) This table gives the limiting quality of the corresponding sampling plans for the two AQLs and various samples used in Tables 1 to 5 for 1% risk. The sampling plan with a sample size of 8 only uses the following destructive inspection items. Part
A1 Random sampling
GB 1260990
Appendix A
Sample extraction
(reference part)
Sampling should meet the requirements of randomness and make the sample representative. For this reason, the products should be fully mixed before sampling. When the mixing of the inspected products is implemented, the sampling method should pay more attention to reducing deviations. For example, products stored in layers should be sampled according to the method specified in 5.2; products produced in the form of rack plating should be sampled in proportion at different parts, etc. Large batches of products are randomly sorted and can be sampled according to the methods described in A2 and A3. A2 Sampling using a random number table
A2.1 Random number table
This appendix provides a random number table (Table 1). In order to use this table, each product in the batch must be clearly marked with a different number, which can be achieved by placing the products on the shelf and placing them on the shelf. The rows and columns on the shelf are clearly numbered. If product 1 has a serial number, these serial numbers can be used.
Suppose that 13 products are to be randomly selected from an inspection batch consisting of product units numbered 1 to 80. One way to select random numbers from Table 1 is: randomly point the pencil to a number in the table and start reading from this point: throw a coin to decide which direction to ask the number, read the front side up and the back side down: suppose the pencil falls on row 11 and column 10, and the back of the coin is facing up, so decide to read down this column and take the first two digits of each five-digit number. The random number selection is carried out in the following way: do not use number 85 because it exceeds 80, do not use the first number 06 because it has appeared once: the sample consists of product numbers 31, 20,826, 53, 65.64, 4622, 6,41,67 and 14. A3 Random Sampling with Equal Intervals
A3.1 Random Sampling with Equal Intervals
When the order of product arrangement is of particular importance (e.g., products placed on a tray), random samples may be drawn at equal intervals. In this method, a constant interval is maintained between the products sampled. Every 9th, 19th, or 24th product in a sequentially numbered batch may be sampled. The first product selected from the batch is determined by a random number table, and all other products are sampled at equal intervals after the first product, with the interval constant being the batch divided by the sample size. A3.2 Example
As an example, suppose a batch of 8,000 products is to be visually inspected for pinholes, pitting, rust spots, and other defects. According to Table 1, a minimum of 200 samples must be drawn. The interval constant should be 40. The first step is to select a random number between 1 and 40 according to Table A1 or other appropriate methods. After obtaining the first sample, the remaining samples required are selected from every 40 products in the batch until a total of 200 samples are obtained.
3685753342
2891869578||tt ||52636192737
87529[85689
7104808178
Random number table
39 milli40
79936156865
77452116308
1973192420
827971
56170 86824 | | tt | | tt | 66134
71500 64568
64161 18296
3258686679
64760 164594
75470,66520
91402142416
5426285963
37888: 38917
4259527958
56843: 96999
18584118845
80631191821
6276536605
133362
70060:28277
5397654914
7607229515
6436467412
157491
3013404024
102304
83974 29992
33349 : 31926
193526
81953105520
3040583946
! 20206
3893564202
3162476884
:71426
Continuation Table A1
11H8924413
3839191132
23792 :14422
85900198275
014542
161607
669651984201
125842
710601
1505945799
32888 ,52390
82674166523
33309: 57047 | | tt |
4791402584
89917 :15665
6153531355
53:589
3550920468
0410246880
74353 1 68668 | | tt | | 35083.19687 | |tt||11508 70225
1992-1
70331|8592238321
158358
8290692431
GB 12609—
Continuation Table A1
#110630147
1057318619
00959: 16487
67682: 43218
09060: 64297||tt ||5315813564
46891.240102556086355
6317680303
1627507100
10541838982
03574 1 17668
47589 : 031 24
61337 : 06177 | |tt | 71945:0.422
162757
! 26759
76020 :79921
17075127698bZxz.net
1229302753
31136:79180
[17095
7867584081
8165150245|| tt||1786945349
0790151339
83581.80377
261230515559191
852054100112535
114751 95434
202031834
21216 -98442
256511
7401164708
66227138358
58204 63868
1482723235||tt| |0082180703
501213831
157306
49105174860
52689.51275
52799 28225
038627809550:36
8878219448
3464888022
70959174725
73381: 80719
9018336600784m
90053 : 8953476036 : 4919943716 975181377239560
This standard is also proposed by the Ministry of Aerospace Industry of the People's Republic of China162738 11686
12418865371
This standard is under the jurisdiction of the National Technical Committee for Standardization of Metal and Non-Enterprise Micro-Crowns 23717
6085975567
82558 :05250
3192557031|| tt||35603 H5171
3789040139
This standard was issued by the Seventh () Eighth Institute of the Ministry of Industry of the Aviation University of China, and drafted by the Electronic Standardization Research Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Yang Xue and Zhao Changquan , Wang Anjian, Zhou Yuezong, Jiang Fangqing. 4762515665 | tt||9175472772
73817132523
11052|91491
91281:68833
：12682
11508 70225
1992-1
70331|8592238321
158358
8290692431
GB 12609—
Continuation Table A1
#110630147
1057318619
00959 : 16487
67682: 43218
09060: 64297 | 47589 : 03124||tt ||61337: 06177 | |tt | 71945:0.422
162757
! 26759
76020 :79921
17075127698
1229302753
31136:79180
[17095
7867584081
8165150245|| tt||1786945349
0790151339
83581.80377
261230515559191
852054100112535
114751 95434
202031834
21216 -98442
256511
7401164708
66227138358
58204 63868
1482723235||tt| |0082180703
501213831
157306
49105174860
52689.51275
52799 28225
038627809550:36
8878219448
3464888022
70959174725
73381: 80719
9018336600784m
90053 : 8953476036 : 4919943716 975181377239560
This standard is also proposed by the Ministry of Aerospace Industry of the People's Republic of China162738 11686
12418865371
This standard is under the jurisdiction of the National Technical Committee for Standardization of Metal and Non-Enterprise Micro-Crowns 23717
6085975567
82558 :05250
3192557031|| tt||35603 H5171
3789040139
This standard was issued by the Seventh () Eighth Institute of the Ministry of Industry of the Aviation University of China, and drafted by the Electronic Standardization Research Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Yang Xue and Zhao Changquan , Wang Anjian, Zhou Yuezong, Jiang Fangqing. 4762515665 | tt||9175472772
73817132523
11052|91491
91281:68833
：12682
11508 70225
1992-1
70331|8592238321
158358
8290692431
GB 12609—
Continuation Table A1
#110630147
1057318619
00959 : 16487
67682: 43218
09060: 64297 | 47589 : 03124||tt ||61337: 06177 | |tt | 71945:0.422
162757
! 26759
76020 :79921
17075127698
1229302753
31136:79180
[17095
7867584081
8165150245|| tt||1786945349
0790151339
83581.80377
261230515559191
852054100112535
114751 95434
202031834
21216 -98442
256511
7401164708
66227138358
58204 63868
1482723235||tt| |0082180703
501213831
157306
49105174860
52689.51275
52799 28225
038627809550:36
8878219448
3464888022
70959174725
73381: 80719
9018336600784m
90053 : 8953476036 : 4919943716 975181377239560
This standard is also proposed by the Ministry of Aerospace Industry of the People's Republic of China162738 11686
12418865371
This standard is under the jurisdiction of the National Technical Committee for Standardization of Metal and Non-Enterprise Micro-Crowns 23717
6085975567
82558 :05250
3192557031|| tt||35603 H5171
3789040139
This standard was issued by the Seventh () Eighth Institute of the Ministry of Industry of the Aviation University of China, and drafted by the Electronic Standardization Research Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Yang Xue and Zhao Changquan , Wang Anjian, Zhou Yuezong, Jiang Fangqing. 4762505250
3192557031
35603 H5171
3789040139
This standard was issued by the Seventh () Eighth Institute of the Ministry of Industry of the Aviation University of China, and was drafted by the Electronic Standardization Research Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Yang Xue, Zhao Changquan, Wang Anjian, Zhou Yuezong, and Jiang Fangqing. 4762505250
3192557031
35603 H5171
3789040139
This standard was issued by the Seventh () Eighth Institute of the Ministry of Industry of the Aviation University of China, and was drafted by the Electronic Standardization Research Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Yang Xue, Zhao Changquan, Wang Anjian, Zhou Yuezong, and Jiang Fangqing. 47625
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