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Zinc Plating has white & red rust without a cause

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Q. One of my customers received Zinc Plating Bolts from us in White and Red Rust condition but we are not sure how this has happened. The bolts are packed inside Water proof packing and this packing had been tested in our labs before implementation.
All the zinc plated bolts have also been tested via SST method for 48 hours and no rust was found. Even our old stock lying for more than 2-3 months have no rust on them.

The coating on average was 10 to 15 microns.

Arvind Yadav
- Kolkata West Bengal, India
November 14, 2023

A. Hi Arvind.
We probably don't have enough facts yet to support anything but guesses; mine is the parts were wet when they went into the waterproof packing.
Luck & Regards,

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

A. Arvind,

You have to analyze iron contamination in your zinc bath (tank) possibility to cause rust spot, or fish out parts from zinc tank.

Popatbhai B. Patel
electroplating consultant - Roseville, Michigan
February 14, 2024

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