| Summary: | 碩士 === 國立高雄大學 === 化學工程及材料工程學系碩士班 === 101 === Screws and nuts are the main export products of Taiwan, the materials range from low, medium and high carbon steel to alloy steel and stainless steel, and these products are widely used in construction, shipbuilding, aircraft, furniture, etc., they use of the corrosion resistance in addition to their base, you can also do surface treatment on its surface, coated with a thin layer of metal, it greatly improves the corrosion resistance and also the appearance improvement.
In the electroplating process, the first step is done without rust and oil, called pre-treatment. Therefore the quality of the plating with some influence. In this study, we investigated in detail about by the pre-treatment of surface roughness on the substrate after the zinc coating, and corrosion resistance.
From the experimental results, the length of time through pickling, roughness from low rise, but after 6 minutes, the roughness of the trend already apparent ease; sizes and different roughness caused by the plating thickness of the coating will be the difference, the greater the roughness, the thickness of the thinner, smaller and roughness, the thickness of the thicker; in terms of adhesion, surface roughness of the test piece with 4.13μm coating peeling, the adhesion was poor; in structure, and were galvanized layer, there are no other structures exist.
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