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topic 61110

Remove hand sanitiser stains from hot dip galvanised material

May 17, 2020

Q. Please advise: as per the government instruction we have spread sanitiser on the hot dip galvanised material to kill pandemic virus Covid-19. Now what happened after two days later is we found etching mark (White dots) on the hot dip galvanised material.

61110-1

It looks like white rust or wet storage stain. Please suggest how to remove these stain marks from the material.

Gopinath Harichandran
- THANE, India

September 1, 2020

A. There seems no good reason to spread sanitiser on a zinc surface after galvanizing. Are you suggesting this virus will withstand the process?

Now to clean up after making this mistake:
A dilute solution of citric acid followed by a water wash might work. Try a small area first. It works OK for standard white rust.

Is your customer claiming this material does not meet a quoted standard agreed with the galvanizer prior to order?

Geoff Crowley
Crithwood Ltd.

Westfield, Scotland, UK

adv.
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