Salt Spray Chamber for EV Components - ISO 23274 Battery Corrosion Test

In order to prevent steel products from stress corrosion cracking in salt spray test, the following comprehensive measures can be taken:

1. Reasonable selection of metal materials

Select alloy materials with good stress corrosion resistance, such as low-alloy high-strength steel, stainless steel, etc. These materials contain alloying elements that can improve corrosion resistance, such as chromium, nickel and molybdenum.

2. Optimized structural design

Avoid stress concentration: Avoid stress concentration parts such as sharp corners and notches as much as possible when designing, and use rounded transition to disperse the stress.

Reduce residual stress: Reduce the residual stress inside the material through reasonable processing technology and heat treatment, such as annealing and normalizing.

3. Surface treatment and coating protection

Electroplating and chemical plating: using galvanizing, nickel plating and other plating methods, or chemical plating such as chemical nickel-phosphorus alloy, etc., to form a protective film, isolate the corrosive medium.

Organic coating: Use high-performance anti-corrosion coatings, such as epoxy resin coatings, polyurethane coatings, etc., to ensure that the coatings are uniform and non-porous, in order to effectively block the intrusion of chloride ions.

4. Heat treatment

Stress relief annealing: Stress relief annealing is carried out on the parts subject to stress to reduce the residual stress inside them and improve the stress corrosion resistance.

Improvement of microstructure: Improve the microstructure of steel materials through appropriate heat treatment process, such as quenching and tempering, to improve its corrosion resistance.

5. Environmental control and media treatment

Reduce the environmental humidity: In the salt spray test, try to control the environmental humidity within a reasonable range, reduce the water to promote corrosion.

Add corrosion inhibitors: add the appropriate amount of corrosion inhibitors in the salt spray test solution, such as organic amines, imidazolines, etc., to slow down the corrosion rate.

6. Regular testing and maintenance

Non-destructive testing: Regular non-destructive testing of key components, such as ultrasonic testing, magnetic particle testing, etc., to detect potential cracks and other defects in a timely manner.

Maintenance: Repair and maintain the discovered corroded parts in time to prevent further expansion of corrosion.

Through the comprehensive application of the above measures, steel products can be effectively prevented from stress corrosion cracking in salt spray testing, and their reliability and durability in actual use can be improved.