Cold rolled plate is best to use sandblasting method to remove the old paint, rust, the cold-rolled plate surface there is a certain degree of roughness. If the conditions are limited, you can also use hand-polished and wind (electric) moving tools to polish the rust way, rust grade standards to ISO 8501-1 St 3 level, that is very thorough manual and power tools rust. Its text is defined as "the surface should be no visible grease and dirt, and almost no adhesion of the oxide, rust, the old coating and different debris. Cold rolled plate surface should have a metallic substrate luster." Different brands of cold galvanized cold rolled sheet material on the surface treatment of the different requirements are different.
Such as cold-rolled plate in the coating before the surface of the cold-rolled plate to allow about 5% of the rust area; ROVAL in the cold-rolled plate surface grinding to st 3, the China Shipbuilding Technology Institute, 60 to 80 microns Film thickness) ROVAL coating.
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