| 摘要 |
PURPOSE: A hot dip galvanizing process for high strength steel sheets with excellent surface property is provided. CONSTITUTION: The method includes the steps of preparing a pretreatment solution containing 10-25% of sulfuric acid or chloric acid, 0.5-2% of hydrogen peroxide; immersing a high strength steel sheet containing one or more constituents selected from Si less than 2 wt.%, Mn less than 3 wt.%, and Cr less than 3 wt.% in the pretreatment solution(ambient temperature to 30°C) for 2-7 seconds before annealing the high strength steel sheet to form ferrous oxide; annealing and hot dip galvanizing under conventional conditions.
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