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topic 61145

Copper plated aluminum sand casting gets brown dots


August 17, 2020

Q. we are doing Zincating, bright nickel, acid copper on aluminium sand cast decorative items. We face brown dots after 2 or 3 days after spray lacquering. Our process sequence after copper plating: rinse, sulphur 15% concentration, 2 rinses, tamarind water for removing sulphur, then again rinse, anti-tarnish, then lacquering, our components are having some small pin holes due to sand casted.

61145-1b   61145-1a  

I attach photocopy. Please help

vasanth karunakaran
- chennai India


August 22, 2020

Please check your zincating process and let us explore more.

Prof. Karthikeyan Sambantham
- Vellore TAMILNADU INDIA

adv.   
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