This standard specifies the classification, technical requirements, test methods, inspection rules, marking, transportation, packaging and storage of stainless steel pickling and passivation paste. This standard is applicable to the surface treatment of austenitic stainless steel pickling and passivation in one step. CB/T 3595-1994 Stainless steel pickling and passivation paste CB/T3595-1994 Standard download decompression password: www.bzxz.net

Shipbuilding Industry Standard of the People's Republic of China
CB/T3595-94
Stainless steel pickling and passivation paste
1994-10-08 Issued
China State Shipbuilding Corporation Issued
1995-08-01 Implementation
Shipbuilding Industry Standard of the People's Republic of China
Stainless steel pickling and passivation paste
1 Subject content and scope of application
CB/T3595-94
Classification number 05
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation, storage, etc. of stainless steel pickling and passivation paste (hereinafter referred to as passivation paste).
This standard applies to the surface treatment of austenitic stainless steel that combines pickling and passivation. 2 Reference standards
GB619 Chemical reagents
Chemical reagents
Sampling and acceptance rules
Hydrofluoric acid
Chemical reagents Nitric acid
GB983 Stainless steel strips
GB3051
3 Terminology
General method for determination of chloride content in inorganic chemical products Mercury titration
3.1 Vertical adhesion time
The time for the passivation paste applied on the stainless steel surface to remain vertical without displacement. 3.2 Blue dot test color change time
Apply the filter paper soaked with blue dot test liquid to the stainless steel surface after passivation treatment. The time when the filter paper shows blue is used to test the quality of the passivation baking.
4 Product classification
4.1 According to the chloride ion content, the products are divided into two levels: Level 1: Chloride ion content is less than or equal to 25mg/kg Level 1: Chloride ion content is greater than 25mg/kg and less than 100mg/kg. 4.2 Product code:
5 Technical requirements
5.1 Main ingredients
Product classification code: I, 1
Acid pickling passivation
The passivation paste is composed of nitric acid, hydrofluoric acid, corrosion inhibitor, viscosity agent, etc. in a certain proportion. Its density is 1.28~1.30g/cm. 5.2 Appearance
Approved by China State Shipbuilding Corporation on October 8, 1994 and implemented on August 1, 1995
CB/T3595-94
The appearance of the passivation paste is a milky white translucent animal-like object. 5.3 Raw materials
Nitric acid should comply with the provisions of GB626, and hydrofluoric acid should comply with the provisions of GB620. 5.4 Technical indicators
The technical indicators of passivation are shown in Table 1.
Chloride ion content
Vertical adhesion time (spread thickness 2~3mm) Pickling effect (coating thickness 2~3mm, 50min) Blue point test color change time
Artificial seawater coupon corrosion test
mmol/kg
5×10~8.5×10
No rust on the surface
5.5 Chemical properties
The passivation paste is highly acid corrosive, and corresponding anti-corrosion measures should be taken during packaging, transportation and use. 6 Test methods
Visual inspection is used for appearance inspection.
The density is determined by volume weight method, and the acidity is determined according to the provisions of Appendix A (Supplement). 6.3
The determination of chloride ion base content shall be carried out in accordance with GB3051. 6.4
The determination of vertical adhesion time shall be carried out in accordance with Appendix B (Supplement). The determination of pickling effect shall be carried out in accordance with Appendix C (Supplement). 6.6
The blue dot test color change time shall be carried out in accordance with Appendix D (Supplement). 6.7
The artificial seawater coupon corrosion test shall be carried out in accordance with Appendix E (Supplement). Inspection rules
The quality inspection department of the manufacturer shall be responsible for product inspection and provide an inspection certificate. Batching and sampling shall be carried out in accordance with GB619. 7.3
Type inspection
Type inspection should generally be carried out in any of the following situations: 7.3.1
Trial design and identification of new products or old products transferred to the factory for production; b.
After formal production, if there are major changes in structure, materials, and processes that may affect product performance, regular inspections should be carried out periodically during normal production or after a certain amount of production has been accumulated; when the product is resumed after a long period of suspension: when the factory inspection results are significantly different from the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. 7.3.2 Type inspection items are shown in Table 2.
5×10~8.5×10*
>25~100
No rust on the surface
Chloride ion content
Vertical adhesion time
Pickling effect
Blue dot test color change time
Artificial seawater coupon corrosion test
7.4 Factory inspection
See Table 3 for factory inspection items.
Chloride ion content
Vertical adhesion time
Pickling effect
Invitation point inspection time
Marking, packaging, transportation and storagebzxZ.net
8.1 Marking
CB/T3595-94
Inspection method
Inspection method
Products are bottled or barreled, and should have product name, code, batch number, weight, production unit, production date, corrosive, non-invertible and other marks.
2 Packaging
The product is packaged in large-mouthed ethylene plastic bottles (or barrels), with a net weight of 1kg per bottle and 25kg or 50kg per barrel. 8.3 Transportation
This product should be transported in accordance with the relevant transportation regulations for corrosive and non-invertible storage. 8.4
The product should be stored in a light-proof, ventilated, cool place, and the storage period is - years. 3
A1 Principle of the method
CB/T3595—94
Appendix A
Method for determining the acidity of stainless steel pickling passivation paste (supplement)
Use phenolic acid as an indicator and titrate the aqueous solution of the passivation kidney with a sodium hydroxide standard solution. A2 Reagents
All reagents used are analytically pure.
A2.1 Sodium hydroxide (analytical pure): 0.1mol/l. A2.2 Phenolic acid (analytical pure): 0.5%
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