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標題: 電解沉積Al2O3與ZrO2陶瓷膜/無電鍍鎳在塑膠發泡用SAE 4118模具鋼之抗蝕性研究
Corrosion Resistance ofElectrolytic Deposition of Al2O3 and ZrO2/Electroless Nickel Plating on SAE 4118 mold steel
作者: 郭俊一
Kuo, Chun-Yi
關鍵字: electrolytic deposition;電解沈積;Al2O3;ZrO2;electrochemical impedance spectroscopy;corrosion resistance;氧化鋁;氧化鋯;交流阻抗;抗蝕性
出版社: 材料工程學研究所
但浸泡實驗顯示,噴塗鐵氟龍的試片在浸泡過程中,鐵氟龍與試片容易發生剝離的現象,造成基材的腐蝕,而氧化鋁與氧化鋯則無此現象,將試片浸於5 M HCl中經60及120分鐘後,觀察阻抗的變化情形發現,初期以噴塗鐵氟龍試片的阻抗較大,但經浸泡120分鐘後,沉積氧化鋁試片其阻抗則變為最大。

The deposition of electroless nickel, electrolytic oxides / electroless nickel and the coating of teflon were respectively conducted on SAE 4118 mold steel. The corrosion resistance was characterized by dynamic polarization, electrochemical impedance spectroscopy(EIS) and immerse in various concentration of HCl aqueous solution.
The deposition films structures, surface morphology adhesion and wear resistance were also investigated by profilemetry, XRD, SEM, Vickers Hardness, scratch, and wear test respectively。
The oxide film thickness is increased with increasing deposition time and solution concentration, However, the mold cracks were also increased with increasing thickness. From the dynamic polarization tests and EIS, specimens deposited ZrO2 for ta1-2 and Al2O3 for tb1-1 showed better corrosion resistance and the specimen coated teflon showed the best at the initial 10 minutes. After immersed in 5 M HCl for 120 minutes or more, the Al2O3 deposited specimen showed the greatest impedance, the teflon film was detached from the substrate after 7 days。
Both scratch tests and surface force test showed that the adhesion of ZrO2 or Al2O3 on electroless nickel was better than that of teflon, since the bonding of teflon with substrate was mechanical, but the bonding of oxides with substrate was chemical. Besides, the wear test showed that the wear loss of alumina deposited specimens was the least due to it is highest hardness and lowest friction coefficient。
Appears in Collections:材料科學與工程學系

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