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topic 54111

Corrosion problem on tin plated brass buttons

January 15, 2010

Dear all,

Now we have corrosion problem on button material brass with tin plating. During sampling (100 pieces) with 1% NaCl, 24 hr, 38 °C the result is PASS (no discoloration). I also try 3% NaCl, 6 hr, 40 °C, the result still PASS (no discoloration). But our customer complaint that the buttons (material brass with tin plating) change color to dark brown within 4 days during transportation. Do you have any suggestion about this? Can humidity faster corrosion condition (now rainy season in my country) only less than 1 week? Is there any way to check corrosion condition ?

Nur Husainy
QC - Indonesia

January 18, 2010

My guess is that the copper is migrating up thru a thin tin coating. Consider a nickel strike under the tin.

James Watts
- Navarre, Florida

February 19, 2010

Thanks for your information. After we check plating condition, the corrosion button was not our products.

Corrosion product have plating step as below :

Material Brass + Copper Strike + Nickel Plating

Our Product have plating step as below :

Material Brass + Nickel color plating (Nickel-free and lead-free: alloy of tin etc)

After we check corrosion plating condition, nickel plating too thin. Then Copper easy to migrate become discoloration.

Nur Husainy
- Tangerang, Indonesia

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