Process for the continuous dip coating of a steel strip
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United States of America Patent
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Jun 8, 1993
Grant Date -
N/A
app pub date -
Apr 12, 1991
filing date -
Apr 13, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for continuous dip coating of a steel strip by passing it through a zinc bath containing aluminum and silicon wherein the aluminum content is approximately 55% by weight, the silicon content is 1% to 2% by weight, and the bath further includes strontium in a quantity in the range of 0.0001% to 0.2% by weight and at least one other element selected from among vanadium in a quantity in the range of 0.02% to 0.2% by weight and chromium in the range of 0.005% to 0.2% by weight. The addition of strontium and chromium and/or vanadium stabilizes 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 crystallization pattern of the coating is also finer and more regular and is independent of the substrate.
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