Letter 2106

Guess my plating problem

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It's August in Florida, and we rack plate tin (acid sulfate) on aluminum using cyanide zincate and cyanide copper. What do you think the problem is that we had and why?

Seriously.

Bob Morrison
- Ormond Beach, FL

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Your customer was irritable because it is too darned hot? Sorry, don't know. It was interesting trying to formulate a guess that wouldn't make me look foolish, but I'll have to say "uncle". Any other takers?


Ted Mooney, P.E. 
finishing.com
Brick, New Jersey

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Here's a clue:

The August humidity was very high.

Bob Morrison
- Ormond Beach, FL

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Also, like Ted, at the risk of sounding foolish;here's my guesses: 1. the tin is turning yellow due to high heat and humidity. 2. you are seeing blistering over time due to one of many possible problems, such as, overtemp zincate resulting in a deposit that is to thick, or maybe it was so humid that the tin actually started to flow?? Please enlighten us.

JEFF

Jeff Mills
metal finishing shop - Gorham, Maine

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here's the $64,000 clue:

the problem takes a few days to show up.

Bob Morrison
- Ormond Beach, FL

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