Aluminum zinc creates a more effective barrier than pure zinc because non-volatile aluminum oxides are formed. Zinc, which is also present in the coating layer, provides cathodic protection to the sheet. In a short time period, this cathodic protection in the aluminum zinc works much slower, which may result in the cut area appearing brown at first. However, due to this combination of protective measures, the aluminum zinc sheet becomes a perfect form of protection against corrosion in the long run. Aluminum zinc with AZ 185 additives serves as great anti-corrosive protection during processing (without any additional coating) and can therefore be used in the M3 environmental class according to the resolution of the Corrosion Institute. Aluminum zinc has been successfully used in roofing for 30 years in the USA, nearly 30 years in Australia and over 20 years in Europe.
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