Preparation of steel substrates before application of paints and related products—Tests for the assessment of surface cleanliness—Part6: Extraction of soluble contaminants for analysis—The Bresle method
Some standard content:
ICS 25, 220. 10
National Standard of the People's Republic of China
GB/T 18570. 6--2005/IS0 8502-6 : 1995 Preparation of steel substrates before application of paints and related products-Tests for the assessment of surface cleanliness-Part 6. Extraction of soluble contaminantsfor analysis-The Bresle method
(IS0 8502 6.:1995.IDI
2005-09-14 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
2006-04-01 Implementation
GB/T 18570.62005/ISO 8502-6:1995GB/T18570αSurface preparation of steel substrates before application of paint - Tests for assessment of surface cleanliness" is divided into the following parts: Part 1: Field test for the determination of corrosion products of ferrous metals (technical report): - Part 2: Laboratory determination of chlorides on treated surfaces: - Part 3: Assessment of dust on steel substrates before application of paint (pressure tape method); - Part 4: Guidelines for the assessment of the possibility of condensation before application of paint Part 5: Guidelines for the assessment of the possibility of condensation on steel substrates before application of paint Surface fluoride determination (ion detection tube method), Part 6: Bresle method for sampling of volatile impurities; Part 7: On-site determination of oils and fats! - Part 8: On-site refractometry of moisture; - Part 9: On-site conductivity determination of water-soluble salts: - Part 10: On-site titration determination of water-soluble oxides; Part 11: On-site determination of water-soluble sulfides; - Part 12: On-site titration determination of water-soluble iron ions: - Part 13 Part: Field conductivity determination method for soluble salts. This part is Part 6 of GB/T18570. This part is equivalent to IS08502-6:1995 Surface preparation of steel before coating - Test for evaluation of surface cleanliness - Part 6: Sampling of soluble impurities - Bresle method (English version). This part is equivalent to the translation of 1S08502-6:1995. For ease of use, this part has been modified as follows: a) The term "this international standard" is changed to "this part" b) The decimal point "\" is used instead of the comma "," as a decimal point; the semicolon "\" is used instead of the escape sign "," as a sub-statement d) The foreword and introduction of the international standard are deleted.
Appendix A of this part is a normative appendix.
This part is proposed by China State Shipbuilding Corporation. This part is under the jurisdiction of the Technical Committee on Metal Surface Treatment and Painting Technology before Painting of the National Technical Committee on Standardization of Paints and Pigments. This part was drafted by: China Shipbuilding Industry Comprehensive Technology and Economic Research Institute, China Shipbuilding Industry 11th Research Institute. The main drafters of this part: Miao Hongren, Song Yanyuan, Liu Shuyang, Fu Jianhua. I
1 Scope
GB/T 18570.6--2005/IS0 8502-6:1995 Surface treatment of steel materials before coating
Tests for assessment of surface cleanliness
Part 6: Sampling of soluble impurities
Bresle method
This part of GB! T18570 specifies the method for extracting soluble impurities from the surface of steel materials. This method utilizes a flexible adhesive bag that can be adhered to surfaces of any shape (flat or curved) and in any direction (including downward). This method is applicable to the on-site sampling of soluble impurities on the surface of steel materials before coating. (This part of GB/T 18570 does not include the analysis of volatile impurities. The on-site analysis method is specified in other parts of GB/T 18570.
2 Normative references
The following documents have become the terms of this part through reference to this part of GB/T 18570. For any dated reference, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions apply to this part .
IS0554:1976 Classification of standard atmospheres for conditioning and/or testing IS08501-1:1988>Surface preparation of steel substrates before coating - Visual assessment of surface roughness - Part 1: Rust grades and rust removal grades of uncoated steel substrates and of steel substrates after complete removal of existing coatings ISO8503-2:1988\>Surface preparation of steel substrates before coating - Surface roughness characteristics of steel substrates after blast cleaning - Part 2: Determination of surface roughness grades of steel substrates after abrasive blast cleaning - Comparison of specimens by force method 1S0/IEC Guide 2.1996 - -General Technique and Definitions 3 Principle
A hollow adhesive tape with a permeable material is attached to the surface from which the viable impurities are to be removed, and the solvent is injected into the cavity with a syringe, and then withdrawn into the syringe. This operation is repeated ten times, and then the solvent (which already contains the viable impurities dissolved from the test surface) is transferred into a suitable container for analysis 4 Apparatus and Materials
4.1 Adhesive Bag
The adhesive bag is made of an ageing-resistant, flexible material with closed pores, such as polyethylene foam, and the adhesive bag is hollow. The material in the cavity should be kept intact before use, and the surface of the adhesive bag is coated with a A layer of elastic film, the other side is coated with adhesive material and covered with a removable protective paper:
Note: The narrow cavity and outer edge of the adhesive bag can be of any shape, such as round, rectangular and plaque, etc. 1) GB/T8923:1988 is modified to adopt ISO8501-1:1588. 21IS08503:1985 was converted to GB/T13288-1991 in 1991. IS08503 was divided into 4 parts after revision in 1988. 3) In IS08502-6:1993, this standard is 1$>/1 with: Guide 2:1991. GB/T200:0.1-2002 was modified to adopt IS0/1EL: Guide 2.1996.
GB/T 18570.6--2005/ISO 8502-6.1995 The thickness of the adhesive bag should be 1.5mm ± 0.3mm. The width of the adhesive ring between the outer edge of the adhesive bag and the cavity should be at least 5mm. The adhesive bag with the standard cavity size specified in Table 1 is called a standard adhesive bag. The adhesive bag should be sealed. For this purpose, a simple typical flow measurement test method has been developed (see Appendix A). When testing 12 adhesive bags of the same model, at least 8 should pass the test. The test should be carried out in an approved laboratory and the results should be recorded in the test report. For terms and definitions in this regard, see ISO/IFC Guide 2:1996. Table 1 Standard adhesive bag
Adhesive bag model
A-0155
A-0310
A-0625
A-1250
A-2500
4. 2 Reusable syringe
Maximum syringe volume: 8 mL
Maximum needle diameter: 1 tnm
Maximum needle length, 50mm
4.3 Solvent
Cavity area/nm2
155±2
310±3
625±6
1250±13
2500-25
Used to measure surface impurities. When measuring water-soluble salts or other water-soluble impurities, use distilled water or deionized water as the solvent. 4.4 The contact thermometer
has an accuracy of 0.5°C and a scale interval of 0.5°C. 5 Test steps
5.1 Take a piece of adhesive bag (4.1) of appropriate size (see Table 1), remove the protective paper and the material that opens the cavity, see Figure 1. 5.2 Squeeze the adhesive edge of the adhesive bag on the test surface to squeeze out as much air as possible from the cavity of the adhesive bag, see Figure 2 5.3 Fill the syringe (4.2) with solvent (4.3), see Figure 3. Note: The volume of solvent injected into the cavity of the adhesive bag is most proportional to the area of the cavity, and the commonly used amount is 2.6×10-\mL/mm=0.6×10\mL/mm 5.4 Close to the test surface, insert the needle of the syringe through the adhesive foam ring at an angle of about 30 degrees into the cavity formed by the test surface and the elastic film, see Figure 4.
If the syringe needle is difficult to insert into the cavity of the adhesive bag, bend the needle as necessary. 5.5 Inject the solvent to ensure that the entire test surface is moistened, see Figure 4. If it is necessary to avoid air residue in the cavity of the adhesive bag, inject in two steps as follows: first inject half of the solvent and suck the air into the syringe by reverse operation. Then remove the needle from the adhesive bag, hold the needle tip upward into the syringe, empty the air, and then insert the needle into the cavity again and inject the remaining solvent. 5.6 After a time agreed upon by the parties concerned, withdraw the solvent, see Figure 5. Note: On the surface without craters after irradiation, satisfactory results can be achieved in 10 minutes, that is, by then, more than 0% of the soluble benefits have been dissolved. 5.7 Keeping the syringe needle in the adhesive bag, inject the solvent into the cavity again and then withdraw it into the syringe barrel. Repeat the injection-withdrawal cycle at least 4 times. 5.8 At the end of the last cycle, recover as much solvent as possible from the cavity and transfer it to a suitable container for analysis, see Figure 6.
Note: In most cases, about 95% of the surface disposable impurities should be removed by the operation of steps 5.3-5.8. Then, almost all of the remaining 5% can be removed by taking the solvent and repeating the above steps.
5.9 During the process of 5.3-5.8, no solvent should be lost from the adhesive bag or syringe. If solvent is lost, the obtained solution should be discarded. 5.10 After completing 5.8, disinfect and wash the syringe so that it can be used again. If the bent needle does not need to be straightened or bent again, it is best to keep it as it is for 2
.
GB/T18570.6—2005/IS08502-6:19955.11 Record the temperature of the steel surface with a contact thermometer (1.4) to an accuracy of 0.5°C Remove the protective paper and the material that opens the cavity
Figure 2 Attach the adhesive bag to the test surface
Figure 3 Fill the syringe with solvent
CB/T 18570,6—2005/IS0 8502-6:1995 Figure 4 Injecting solvent into the cavity of the adhesive bag
(Perform the operation in accordance with the provisions of 5.4)
Figure 5 Withdrawing solvent from the cavity of the adhesive bag
Figure 6 Transferring solvent to a suitable container for analysisTest report
The test report should at least include the following:
Standard number of this part (GB/18570.6-2005): Solvent used;
Volume of injection drop;
GB/T18570.6-2005/IS0 8502-6:1995Total contact time between solvent and steel surface, that is, the time spent in 5.6 multiplied by the total number of cycles: Temperature between steps 5.3 and 5.8;
Test date,
GB/T18570.6-2005/IS0 8502-6.1995A,1 General
Appendix A
(Normative Appendix)
Typical Leak Test Method
The removal of impurities from the steel surface depends largely on the tightness of the adhesive bag, including the degree of adhesion between the adhesive bag and the steel surface.
Solvent leakage is more likely to occur when the steel surface is not clean (such as dust or moisture on the cover) or rough (such as pits remaining after blast cleaning).
Leakage may also occur when the internal pressure of the adhesive bag is high and lasts for a long time. In the following leak test, the above aspects that affect leakage are greatly magnified to facilitate the typical test of adhesive bags with rubber elastic membranes.
Note: This test method can also be used for production inspection and delivery inspection of such adhesive bags. In addition, this method can also be used to compare and predict the possible difficulties in the separation of small soluble impurities (No. 5). However, this test does not guarantee that every adhesive station will meet the requirements in all cases.
A.2 Principle
A piece of adhesive bag is glued to a clean steel plate of known roughness. Water is poured into the cavity to generate internal pressure to squeeze the adhesive bag. After a specified time, check whether the adhesive bag leaks. A.3 Apparatus and materials
A. 3. F Adhesive bag
See 4.1.
A.3.2 Mesh clean steel plate
Appropriate size, such as 160 mm × 150 mm, initial rust grade D, pre-treated to DSa2 specified in ISO8501-1, "angular" specified in ISO8503-2, grade "coarse". A.3.3 Syringe
See 4, 2.
A, 3.4 Water
Distilled water or deionized water.
A.3.5 Timer
A 4 Steps
The test is carried out under the 23/50 condition with a wider filling tolerance as specified in ISO 554. Note: The values 23 and 50 refer to the temperature in degrees Celsius and the relative degree of contamination in percent, respectively. Three times
A.4.1 The adhesive bag (A.3.1) is attached to the steel plate (A.3.2). Then, a certain volume of water (A.3.4) is injected into the syringe (A, 3.3) as specified in Table A1.
Adhesive bag model
A-0155
A-0310
A-0625
A-1250
A-2500
A,4.2 Start the timer (A.3.5),
GB/T18570.6—2005/ISO8502-6：1995 Volume of injected water/ml
0. 810. 1
3. 7± 0. 1
14.9±0.1
39.5±0.1
A.4.3 Check for leakage. Repeat the check at least every 5 minutes after the start of the test (A.4.2) and stop after 20 minutes. A.4.4 If leakage occurs within 20 minutes, record the leakage time and mark the leakage point of the adhesive bag. A.4.5 If there is no leakage within 20 minutes, the adhesive bag has passed the leak test. A.5 Test report The test report should at least include the following: a) Model and size of the tested adhesive line; Volume of water injected; Time when leakage occurs within 20 minutes; Leakage point; Test date.6—2005): solvent used;
volume of injection drop;
GB/T18570.6-2005/IS0 8502-6:1995 total contact time between solvent and steel surface, that is, the time spent in 5.6 multiplied by the total number of cycles: temperature between steps 5.3 and 5.8;
test date,
GB/T18570.6-2005/IS0 8502-6.1995A,1 General
Appendix A
(Normative Appendix)
Typical leak test method
The removal of impurities on the steel surface depends largely on the leak-proofness of the adhesive bag, including the degree of bonding between the adhesive bag and the steel surface.
Solvent leaks are more likely to occur when the steel surface is not clean (e.g. dust or moisture on the cover) or rough (e.g. pits remain after blast cleaning).
Leaks may also occur when the internal pressure of the adhesive bag is high and lasts for a long time. In the following leak test, the above aspects that affect leakage are greatly magnified to facilitate typical testing of adhesive bags with rubber elastic membranes.
Note: This test method can also be used for production inspection and delivery inspection of such adhesive bags. In addition, this method can also be used to compare and predict the possible difficulties (5th luck) that may be encountered during the separation of small soluble impurities. However, of course, this test cannot guarantee that every adhesive station will meet the requirements in all cases.
A.2 Principle
A piece of adhesive bag is glued to a clean steel plate of known roughness. Water is injected into the cavity to generate internal pressure to squeeze the adhesive bag. After a specified time, check whether the adhesive bag leaks. A.3 Apparatus and materials
A. 3. F Adhesive bag
See 4. 1.
A.3.2 Mesh gauge Clean steel plate
Appropriate size, such as 160 mm × 150 mm, initial rust grade D, after pretreatment to achieve DSa2 specified in ISO8501-1 and "angular" specified in ISO8503-2, grade "coarse". A. 3. 3 Syringe
See 4, 2.
A, 3. 4 Water
Distilled water or deionized water.
A. 3. 5 Timer
A 4 Steps
The test is completed under the 23/50 condition with a wider filling difference specified in ISO554. Note: The values 23 and 50 refer to the temperature in Celsius and the relative degree of mixing in percentage, three times
A.4.1 Paste the adhesive bag (A.3.1) on the steel plate (A.3.2), and then, according to Table A1, inject a certain volume of water (A.3.4) with a syringe (A,3.3).
Adhesive bag model
A-0155
A-0310
A-0625
A-1250
A-2500
A,4.2 Start the timer (A.3.5),
GB/T18570.6—2005/ISO8502-6：1995 Volume of injected water/ml
0. 810. 1
3. 7± 0. 1
14.9±0.1
39.5±0.1
A.4.3 Check for leakage. Repeat the check at least every 5 minutes after the start of the test (A.4.2) and stop after 20 minutes. A.4.4 If leakage occurs within 20 minutes, record the leakage time and mark the leakage point of the adhesive bag. A.4.5 If there is no leakage within 20 minutes, the adhesive bag has passed the leak test. A.5 Test report The test report should at least include the following: a) Model and size of the tested adhesive line; Volume of water injected; Time when leakage occurs within 20 minutes; Leakage point; Test date.6—2005): solvent used;
volume of injection drop;
GB/T18570.6-2005/IS0 8502-6:1995 total contact time between solvent and steel surface, that is, the time spent in 5.6 multiplied by the total number of cycles: temperature between steps 5.3 and 5.8;
test date,
GB/T18570.6-2005/IS0 8502-6.1995A,1 General
Appendix A
(Normative Appendix)
Typical leak test method
The removal of impurities on the steel surface depends largely on the leak-proofness of the adhesive bag, including the degree of bonding between the adhesive bag and the steel surface.
Solvent leaks are more likely to occur when the steel surface is not clean (e.g. dust or moisture on the cover) or rough (e.g. pits remain after blast cleaning).
Leaks may also occur when the internal pressure of the adhesive bag is high and lasts for a long time. In the following leak test, the above aspects that affect leakage are greatly magnified to facilitate typical testing of adhesive bags with rubber elastic membranes.
Note: This test method can also be used for production inspection and delivery inspection of such adhesive bags. In addition, this method can also be used to compare and predict the possible difficulties (5th luck) that may be encountered during the separation of small soluble impurities. However, of course, this test cannot guarantee that every adhesive station will meet the requirements in all cases.
A.2 Principle
A piece of adhesive bag is glued to a clean steel plate of known roughness. Water is injected into the cavity to generate internal pressure to squeeze the adhesive bag. After a specified time, check whether the adhesive bag leaks. A.3 Apparatus and materials
A. 3. F Adhesive bag
See 4. 1. bzxz.net
A.3.2 Mesh gauge Clean steel plate
Appropriate size, such as 160 mm × 150 mm, initial rust grade D, after pretreatment to achieve DSa2 specified in ISO8501-1 and "angular" specified in ISO8503-2, grade "coarse". A. 3. 3 Syringe
See 4, 2.
A, 3. 4 Water
Distilled water or deionized water.
A. 3. 5 Timer
A 4 Steps
The test is completed under the 23/50 condition with a wider filling difference specified in ISO554. Note: The values 23 and 50 refer to the temperature in Celsius and the relative degree of mixing in percentage, three times
A.4.1 Paste the adhesive bag (A.3.1) on the steel plate (A.3.2), and then, according to Table A1, inject a certain volume of water (A.3.4) with a syringe (A,3.3).
Adhesive bag model
A-0155
A-0310
A-0625
A-1250
A-2500
A,4.2 Start the timer (A.3.5),
GB/T18570.6—2005/ISO8502-6：1995 Volume of injected water/ml
0. 810. 1
3. 7± 0. 1
14.9±0.1
39.5±0.1
A.4.3 Check for leakage. Repeat the check at least every 5 minutes after the start of the test (A.4.2) and stop after 20 minutes. A.4.4 If leakage occurs within 20 minutes, record the leakage time and mark the leakage point of the adhesive bag. A.4.5 If there is no leakage within 20 minutes, the adhesive bag has passed the leak test. A.5 Test report The test report should at least include the following: a) Model and size of the tested adhesive line; Volume of water injected; Time when leakage occurs within 20 minutes; Leakage point; Test date.
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