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#155 Corrosion Resistance Testing Methods of Platings

Category : Electroplating
March22, 2013

Corrosion resistance tests of platings are conducted with the following methods.

1. Neutral salt water spray testA method of plating corrosion resistance testing in an atmosphere of sodium chloride solution mist by the use of salt water spray test device.
Sodium chloride concentration 40g/L, pH=6.5
Spray 1.0 - 2.0mL/80cm2/h, Air saturator temp. 47±2℃,Salt water tank temp. 35±2℃, Test chamber temp. 35±2℃
Corrosion resistance evaluation: Evaluate by obtaining a rating number of surface corrosion defects based on the standard chart or actual measurement.
2. Acetic acid salt water spray testA method of plating corrosion resistance testing in an atmosphere of acetic acid sodium chloride solution mist by the use of salt water spray test device.
Sodium chloride concentration 40g/L, Adjust to pH=3.0
with acetic acid. Spray 1.0 - 2.0mL/80cm2/h, Air saturator temp. 47±2℃, Salt water tank temp. 35±2℃, Test chamber temp. 35±2℃
Corrosion resistance evaluation: Evaluate by obtaining a rating number of surface corrosion defects based on the standard chart or actual measurement.
3. CASS testA method of plating corrosion resistance testing in an atmosphere of copper chloride added acetic acid sodium chloride solution mist by the use of CASS testing device.
Sodium chloride concentration 40g/L, Copper chloride solution concentration 0.205g/L, pH=3.0, Spray 1.0 - 2.0mL/80cm2/h, Air saturator temp. 63±2℃, Salt water tank temp. 50±2℃, Test chamber temp. 50±2℃
Corrosion resistance evaluation: Evaluate by obtaining a rating number of surface corrosion defects based on the standard chart or actual measurement.
4. Corrodkote testA method of plating corrosion resistance testing by placing a Corrodkote mud pasted and dried test specimen in a humid chamber.
The Corrodkote mud is formulated with Copper nitrate solution (5g/L) 7mL, Ferric chloride solution (5g/L) 33mL, Ammonium chloride solution (100g/L) 10mL mixed evenly with Kaolin clay 30g.
Humid chamber temp. 38±2℃, Relative humidity 80~90%
Corrosion resistance evaluation: Evaluate by obtaining a rating number of surface corrosion defects based on the standard chart or actual measurement.
5. Sulfur dioxide testA method of plating corrosion resistance testing in an atmosphere of sulfur dioxide by using a sulfur dioxide testing device.
Sulfur dioxide concentration 25±5ppm or 1000±50ppm, Test chamber temp. 40±1℃, Relative humidity 90±5%
Corrosion resistance evaluation: Evaluate by obtaining a rating number of surface corrosion defects based on the standard chart or actual measurement.

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