The JIS grades of corrosion resistance for plating must be at least Grade 9 after the hours of each testing specified in Table.

[Table] Corrosion resistance of nickel and chrome plating

Unit: Hour

* Note 1) Ferroxyle test
This testing is designed for checking the corrosion resistance of copper/nickel plating or nickel/chrome plating applied over steel substrates. In this test, paste a filter paper soaked with ferroxyl test solution over the significant surface and peel it after five minutes. The anti-corrosion properties can be measured by the blue spots indicating the presence of iron complex, which appear on the paper.

* Note 2) Operating environment
A: Highly corrosive outdoor environment, such as coastal areas and industrial zones
B: Normal outdoor environment, such as rural zones and residential areas
C: Highly humid indoor environment, such as bathrooms and kitchens
D: Normal indoor environment, such as inside of houses and offices