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#153 Corrosion Resistance Standards of Platings in Application Environments

Category : Electroplating
March 8, 2013

Platings corrosion resistance standards in application environments are approximately as follows. There are spraying times for salt water spray tests and CASS tests shown in the table. The rating numbers after these tests must be 9 (R.N.9) or greater.

Base metalPlating type,
thickness
Application
environment
Neutral salt water
spray test
CASS test
SteelCu+Ni10b,Cu+Ni15b,Cu+Ni20bD
Normal Interior, Residential home, Office, etc.
24 
Nickel
Nickel alloy
Ni3b,Ni5b,Ni10b
SteelCu+Ni3b,Cr 0.1,Ni3b,Cr 0.1,Cu+Ni5b,Cr 0.1,Ni5b,Cr 0.1,Cu+Ni10b,Cr 0.1,Ni10b,Cr 0.1 4
Cu+Ni5b,Cr 0.1,Ni5b、Cr 0.1,Cu+Ni25b,Cr 0.1,Ni20b,Cr 0.1C
Humid room
 8
Cu+Ni30b,Cr 0.1,Ni25d,Cr 0.1,Ni30b,Cr 0.1,Ni40b,Cr 0.1B
Normal outdoor
 16
Cu+Ni50b,Cr 0.1,Ni30d,Cr 0.1mpA
Corrosive outdoor
 24
Copper,
Copper alloy
Ni2b、Cr 0.1D 4
Ni2b,Cr 0.1,Ni5b,Cr 0.1C 8
Ni10b,Cr 0.1,Ni25b,Cr 0.1B 16
Ni25b,Cr 0.1mpA 24
Zinc alloyCu+Ni10b,Cr 0.1,Cu+Ni15b,Cr 0.1D 4
Cu+Ni20b,Cr 0.1,Cu+Ni25b,Cr 0.1C 8
Cu+Ni30b,Cr 0.1,Cu+Ni40b,Cr 0.1,Cu+Ni30b,Cr 0.1mp,Cu+Ni40b,Cr 0.1mpB 16
Cu+Ni40b,Cr 0.1mpA 24
Aluminum
and its alloys
Ni10b,Cr 0.1D 4
Ni20b,Cr 0.1C 8
Ni30b,Cr 0.1B 16
Ni35d,Cr 0.1mpA 24

Explanation on platings:
b: Glossy plating
d: Dual coat plating (e.g. semi-glossy nickel plating+glossy nickel plating)
mp: Micro porous chrome plating
Cu+Ni10b: Copper plating and glossy nickel plating, total thickness of 10μm

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