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Request for the definition of chromate plus sealer

What is the meaning of Chromate plus sealer? What is the function of sealer when is used in finishing?

Roy Ng Jiu Boon
Yamaichi Seiko (S) Pte Ltd - Singapore, Singapore, Singapore
2003

Many words that are used in metal finishing are context-sensitive. When "sealer" is used with the word "chromate", it probably means a system of chromate conversion coating after plating (probably zinc plating) followed by a silicate or other topcoat after the chromate. These topcoats have become increasingly popular as a way of increasing the corrosion resistance of trivalent chromates.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003

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