Some standard content:
Military Standard of Electronic Industry of the People's Republic of China FL5971
SJ20846---2002
Specification for gold LI potassium cyanide for electroplating2002-10-30Issued
Implementation on 2003-03-01
Approved by Ministry of Information Industry of the People's Republic of China 1 Scope
Military Standard of Electronic Industry of the People's Republic of China Specification for gold ［ I] potassium cyanide for electroplating1.1 Subject Content
SJ20846-—2002
This specification specifies the technical requirements, inspection methods, quality assurance provisions and delivery preparation for potassium cyanide used in electroplating solutions. 1.2 Scope of application
This specification applies to gold cyanide rivets for military electroplating 2 Reference documents
GB190 Dangerous goods packaging mark
GB191 Packaging storage and transportation pictorial mark
3 Requirements
3.1 Appearance
Potassium gold cyanide should be white crystalline powder.
3.2 Gold mass fraction
The gold mass fraction is calculated as A, and its mass percentage is 68.30% ± 0.10%. 3.3 Oiliness
Potassium gold cyanide aqueous solution should be clear and colorless. 3.4 Insoluble matter
The mass fraction of insoluble matter is not more than 0.1%. 3.5 Water
The mass fraction of water is not more than 0.25%.
3.6 Impurities
The mass fraction of impurities should not be greater than that specified in Table 1.
Released by the Ministry of Information Industry of the People's Republic of China on October 30, 2002-iikAoNrKAca
Implemented on March 1, 2003
4 Quality Assurance Provisions
4.1 Inspection Responsibility
SJ 20846-2002
Table 1 Permissible Mass Fraction of Impurities
Maximum Mass Fraction
Unless otherwise specified in the contract or order, the contractor shall be responsible for completing all inspections specified in this specification. If necessary, the ordering party or the superior appraisal agency has the right to inspect any of the inspection items described in this specification. 4.1.1 Responsibility for Conformity
All products must meet all requirements of Chapter 3 and Chapter 5 of this specification. The inspections specified in this specification shall become an integral part of the contractor's entire inspection system or quality program. If the contract includes inspection requirements not specified in this specification, the contractor shall also ensure that the products submitted for acceptance meet the contract requirements. Quality consistency sampling does not allow the submission of products that are known to be defective, nor can the ordering party be required to accept defective products.
4.2 Inspection classification
The inspections specified in this specification are divided into:
a. Identification inspection:
b. Quality consistency inspection.
4.3 Inspection conditions
Unless otherwise specified, all inspections shall be carried out under the following environmental conditions: a
Ambient temperature: 15℃～35℃:
b. Relative humidity: 20%~80%;
c. Atmospheric pressure: 86kPa106kPa.
4.4 Identification inspection
Identification inspection is carried out before the product is officially put into production. When there are major changes in raw materials or manufacturing processes that may affect the identification inspection results, identification inspection should also be carried out.
4.4.1 Inspection location
The identification inspection shall be conducted in a laboratory approved by the identification institution. 4.4.2 Inspection samples
30g of products manufactured by the commonly used equipment and process shall be randomly selected as inspection samples. 4.4.3 Inspection items
The items of identification inspection shall be as specified in Table 2.
4.4.4 Qualification criteria
Inspection items from
Gold mass fraction
Insoluble matter
SJ20846-2002
Required chapter number
Test method chapter number
If the test sample passes all the tests listed in Table 2, the identification inspection is qualified. If one or more of the tests fail, the identification inspection is unqualified and the qualification of identification is not granted. 4.5 Quality consistency inspection
Quality consistency inspection shall be carried out batch by batch
4.5.1 Inspection batch
An inspection batch shall consist of the same raw materials and products from the same production batch. 4.5.2 Quality consistency inspection items
Quality consistency inspection shall be carried out by randomly selecting 30 samples from the inspection batch and conducting the inspection according to the provisions of Table 2. 4.5.3 Qualification criteria
If any item of the product fails to meet the requirements of this specification in the quality consistency inspection, re-sampling shall be carried out and all the inspections shall be carried out again, or only the non-conforming items shall be re-tested. If the qualified items are still not found in the test, the batch represented by the sample is qualified. 4.6 Inspection method
Reagents and instruments
Sulfuric acid: high-grade pure;
Nitric acid: high-grade pure,
Deionized water;
Porcelain crucible;
Muffle furnace;
Oven:
Atomic absorption spectrometer, with \Ag, CuPb, FeNiCr. hollow cathode lamp; analysis temperature, accurate to 0,0001:
Ag~Cu, Pb, Fe, Ni, Cr Standard snake stock solution fmg/ml. Appearance
Use visual inspection.
Mass fraction of gold
Weigh 2g of dry sample (ml, accurate to 0.0001g), put it into a 100ml beaker; add 5mlHzSO4 to the beaker, cover with a watch glass, heat until white smoke appears, keep for 1h, so that the sponge gold condenses into a mass, and cool to room temperature: Note: This step must be carried out in a fume hood or a well-ventilated environment: Slowly add 30ml of deionized water along the wall of the cup, stir well and boil: Filter with medium-speed fixed filter paper and wash with hot water until neutral: Put the sponge gold and filter paper into a porcelain crucible, put it into a muffle furnace after carbonization, burn it at 800℃C for 30min, take it out, and weigh the sponge 3 after cooling to constant weight:
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Gold basis (m2) to constant weight:
SJ20846--2002
f. Result expression: gold mass fraction (Wa/%) = mz/m×100.4.6.4 Turbidity
Weigh 10g sample (m3) and deduct to 0.0001g and put it into a 500ml conical flask, dilute it with water to 200ml, shake it for 5min and let it stand for 2min, and use a visual inspection to check whether the potassium chloroaurite aqueous solution is clear. (This solution can be reserved for the test in 4.6.5.)4.6.5 Insoluble matter
3. Filter the solution in 4.6.4 with a G4 glass sand core funnel (mass m) and wash it thoroughly with water, put the funnel into a 105℃ oven and keep it for 1h, take it out and put it in a desiccator to cool, and weigh it to constant weight (ms); b. Result expression: insoluble mass fraction (W insoluble matter/%) = (ms-m4)/m3×100.4. 6.6 Water content
a. Weigh 10 g of sample (mA) with an accuracy of 0.0005 g and place it in a glass crucible. Place the crucible in an oven at 105°C for 1 h. Take it out and place it in a desiccator to cool. Weigh it to constant weight (m2): Result expression: Water content (W/% by mass) = (m2)/mg × 100. b.
4.6.7 Impurities
4.6.7.1 Methods ~
a. Add the filtrate after separating the gold from the solution in 4.6.5 to a 100 ml volumetric flask (or take a sample and make it up to 50 ml separately) for testing. Prepare mixed standard solutions of Ag, Cu, Pb, Fc, Ni, and Cr with a medium volume fraction of 5% sulfuric acid: pipette 1.00ml, 5.00ml, and 20.00ml of each standard stock solution in b,
in 4.6.1i respectively, dilute to scale with 5% sulfuric acid in three 1000ml volumetric flasks, and mix well. The concentrations of each element in these three volumetric flasks are 1uμg/ml, 5μg/ml, and 20μg/ml, respectively, with blank.
Adjust the instrument to the best working conditions. The wavelengths of each element are shown in Table 3. c
wavelength nm
Use flame atomic absorption spectrometry to determine the mass fraction of Ag, Cu, Pb, Fe, Ni, and Cr. d. Result expression: X=10~c·Vmg×100% Where: X-mass fraction of the element to be measured (Ag, Cu, Pb, Fe, Ni, Cr), %; C---concentration of the element to be measured, μg/ml;
---volume of test solution, ml:
m3----mass of the sample in 4.6.4, g. 4.6.7.2 Method 2
Weigh 5g of dry sample (ms) accurately to 0.0001g, put it into a 50ml beaker, dissolve it with 5% nitric acid, and adjust the volume to a.
in a 50ml volumetric flask.
Prepare a mixed standard push solution of Ag, Cu, Pb, Fe, Ni, and Cr with 5% nitric acid as the medium; pipette 1.00ml, 5.00ml, and 20.00ml of each standard storage solution in 4.6.1i into three 1000ml volumetric flasks, dilute to the scale with 5% nitric acid by volume, and mix. The concentrations of each element in these three volumetric flasks are 1μg/ml, 5ug/ml, and 20μg/ml, respectively, with a blank.
Adjust the instrument to the best working conditions. The wavelengths of each element are shown in Table 4. G.
Wavelength nm
SJ 20846—2002
Determine the mass fraction of Ag, Cu, Pb, Fe, Ni and Cr by flame atomic absorption spectrometry d. Result expression: X=104c·Vlm×100% Where: X—mass fraction of the element (Ag, Cu, Pb, Fe, Ni, Cr), %; C-—concentration of the element, μ g/ml;
V--—volume of test solution, mi;
mass of the sample, name.
4.6.8 Packaging
The packaging and packing of products, as well as the inspection of the packaging and packing and the storage marks shall comply with the requirements of Chapter 5 and the referenced documents of this specification.
5 Delivery preparation
5.1 Storage and packaging
The products shall be packed in clean, sealed, moisture-proof containers that are protected from the sun and the environment. 5.2 Transportation and storage
Put the container with gold cyanide needles in a box and transport it by any means of transportation. The box should not be damaged, damp or exposed to sunlight during transportation. The product should be stored in a clean, dry and sheltered place. 5.3 Marking
5.3.1 Marking of packaging container
A label should be attached to the packaging container of the product. The following contents should be indicated: a.
Product name and batch number of this specification:
Net content;
Production unit;
Production date;
Mass fraction of gold and impurities.
5.3.2 Marking of packaging box
The outer packaging box of the product should have the corresponding markings specified in GB190 and GB191. Notes
Intended usewwW.bzxz.Net
The potassium xenon gold oxide specified in this specification is intended for electroplating of military electronic components. 6.2 Contents of order documents
The following contents shall be stated in the contract or order: a.
Name and number of this specification:
b. Product brand:
Net weight:
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Other contents that need to be specified.
Additional instructions:
SJ20846—2002
This specification is under the jurisdiction of the Fourth Electronic Research Institute of the Ministry of Information Industry. This specification was drafted by the Fourth Electronic Research Institute of the Ministry of Information Industry, Henan Zhongxin Fine Decoration Co., Ltd., and Beijing Physical and Chemical Analysis and Testing Center. The main drafters of this specification are: Liu Yun, Chen Yukun, Ren Haidong, Ding Hui, Song Wei, and Liu Changrang. Project code: B05007.
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