GB/T 10125-2021 specifies salt spray testing to evaluate corrosion resistance of stainless round bars:
Test solution: 5% NaCl by weight, pH 6.5–7.2, sprayed at 35°C.
Exposure periods: Standard periods include 24, 48, 96, 168, 336, 672 hours, with 1000+ hours for premium grades like 316L.
Evaluation criteria: No red rust allowed for 304 after 48 hours; 316L must resist red rust for 168+ hours.
Sample preparation: Specimens must be cleaned with acetone, with edges rounded to prevent artificial corrosion.
This standard ensures consistent corrosion resistance testing, with results correlating well to ASTM B117, facilitating global material acceptance.