plating, anodizing, & finishing Q&As since 1989
Zn coated conduit white rusted in sea voyage
WE HAVE BROUGHT ELECTRICAL CONDUITS(STEEL) FROM JAPAN AND THESE CONDUITS ARE GALVANISED BOTH OUTSIDE AND INSIDE.
THESE CONDUITS WERE BROUGHT AS BREAK BULK CARGO AND NOT IN CONTAINERS. ON RECEIPT OF THESE CONDUITS WE FOUND THAT THEY HAD WHITE PATCHES ALL OVER THE SURFACE. MAY BE THE WHITE RUST. I WOULD LIKE TO KNOW IF THIS IS BECAUSE OF ATTACK OF SEA WATER. IS ZN COATING NOT COMPATIBLE WITH SEA WATER.
SUMMIT STEEL - DUBAI
The white rust is definitely caused by the sea water. At zinc plating not depending if it is acid plated or alcalid (with or without cyanide) you always find the same effect if you do the salt spray test at the lab.
the salt spray test is done to check the quality of the zinc plating. in general a plated part should resist the salt spray test at least for 24h. sea air could cause the same effect also it will take a much longer time to have the effect.
- Munich, Germany
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