Hot dip (or hot) galvanizing is the processing technique to dip the pretreated base substance of carbon steel into melted liquefied zinc to obtain a protective zinc coat. Due to its good anti-corrosion performance, galvanized plate is vastly used in the industries of home appliance, decoration, advertisement, and civil construction, etc. Especially, the home appliance industry (air conditioning outdoor units, washing machine panels, computer cases, microwave ovens, etc.) has large demands on galvanized and color coated plates. According to the traditional methodology, galvanization can be sorted into United States Steel Corp and Sendzimir 2 methods.