PROCESS FOR CONTINUOUS DIP COATING OF A STEEL STRIP

摘要

The steel strip is passed through a zinc bath with an aluminium content of approximately 55% by weight and a silicon content of 1% to 2% by weight, to which is added strontium in a quantity equal to 0.2% maximum by weight and at least one other element selected from among vanadium and chromium, each in a quantity equal to 0.2% maximum by weight. The addition of strontium and chromium and/or vanadium stabilises the structure of the coating and reduces the formation of acicular precipitates of silicon. The coating has an improved adherence and ductility which permits it to be formed without cracking, while retaining an excellent resistance to corrosion. The resulting crystallisation pattern of the coating is also finer and more regular and is independent of the substrate.