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corrosion che habigong industral park hip chemical engineering chromium coating abs coating stability of enzymes activity of enzymes differences between enzyme and catalyst mechanism action of enzyme function of enzyme characteristics of enzyme introduction of enzyme sufactant las detergent lab biosphere hydrosphere atmosphere lithosphere inter corrosion damages cathodic protection practical example prevention causes galvanic corrosion corrosion erosion uniform attack flade potential potentiostatic polarization passivity copper coating semi nickel coating bright nickel coating acrylonitrile-butadiene-styrene labsa