If optimal conditions are not promptly restored after accidental contact with water or excessive humidity, the Z100 galvanizing protection on JVP 4×4 panels can sometimes be triggered, which means the exposed surface will be oxidised to protect the underlying state from corrosion.
This is seen by a variation in the appearance of the sheet metal, with the colour changing to opaque white, sometimes with small quantities of powder. This is irreversible, so the original appearance of the manufactured articles cannot be restored.
However, if the sheet is not too severely affected by oxidation, its mechanical strength is not impacted, so the panel’s general performance is not compromised.
The appearance of initially very small but growing rust spots may indicate that the protective limit has been exceeded, so the steel of the sheet’s body is being attacked. In these situations, the panel’s original performance could be compromised, so it must be replaced.
However, it is important to note that the information above is indicative; occupational safety technicians must assess the objective conditions of each construction site, under their sole responsibility.