... bubble,flaw,scab,crack,impurity and obvious scarification,it can't be have layer.The sickness of steel plate is 1 ... coating is without bubble or metal peel.)The feature of Auto water pump impeller1. Workpiece surface smooth, the transition smooth ... galvanized and so on. Applied Range of Auto water pump impellerWidely used in Auto Industry,petrochemical industry,pharmacy,food wine sewage treatment ...