Advanced White Rust

The white substance is the start of the stabilisation of the zinc coating and is called “white rust”.  If left in very damp and enclosed spaces, this can get so bad it becomes a problem.  If the black areas are easily seen then it is a case of advanced white rust and it is not acceptable.  Specialist advice should be sought.  It is worth noting that this is due to storage of the steel rather than poor coating application.  This is often seen on flat sheet sections that are stored in piles for long periods in wet weather or building steel that gets left on wet sand for prolonged periods of time.  It is best to address the issue before you send it to site or erect it.

white, black, spot, patchy

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