Avoid incompatible metals

Due to a phenomenon known as galvanic corrosion, some commonly used metals can cause accelerated corrosion when used with ZINCALUME® steel or COLORBOND® steel. Copper and lead are two such metals.

Copper pipes and lead flashing should not come in direct contact with either ZINCALUME® steel or COLORBOND® steel. If building design is such that water will flow from lead flashing onto ZINCALUME® steel or COLORBOND® steel then it should be painted.

Water from copper pipes should not be directed onto COLORBOND® steel or ZINCALUME® steel.

Stainless steel fixings and fixings containing copper should also not be used with ZINCALUME® steel or COLORBOND® steel.

This information is intended as a guide only. For more information, please download "Corrosion Technical Bulletin 12 - Dissimilar Metals".