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Liquid Phase Deposition of Oxide Coatings on AISI 440C Stainless Steel
|關鍵字:||AISI 440C Stainless Steel;440C不銹鋼;Electrolytic Deposition;Alumina;Zirconia;Wear;Corrosion;Adhesion Work;電解沉積;氧化鋁;氧化鋯;磨耗;抗蝕性;附著能||出版社:||材料工程學研究所||摘要:||
Liquid phase deposition, such as sol-gel and electrolytic deposition are the relatively new approach in surface engineering. This study uses the electrolytic Al2O3 and ZrO2 coatings and sol-gel Al2O3 coating to enhance the wear and corrosion resistance of AISI 440C stainless steel. The characteristics of the coating have been evaluated, including crystal structure, hardness, wear, adhesion, corrosion, and the comparison with sputtering Al2O3 and CrN coating.
For both two liquid phase deposition, the increasing hardness of the coatings was caused by the series of phase transformations from aluminum hydroxide hydrate (Al(OH)3· H2O) to γ-Al2O3 of electrolytic deposition and boehmite (AlO(OH)) toγ-Al2O3 of sol-gel. The wear resistance was increased with increasing annealing temperature because of the increasing hardness of coating film. In sputtering method, both the scratch tests and the adhesion works calculated from surface energy indicated that the adhesion strength of CrN coating was weaker than the others. Undoubtedly, all of the coated specimens were more corrosion and wear resistant than the uncoated specimens.
The comparison among the electrolytic Al2O3, sol-gel Al2O3 coatings and sputtering Al2O3 coating revealed the deposition rate of electrolytic method is higher than the sol-gel and reactive radio frequency magnetron sputtering methods, and the wear resistance is similar with one another. Besides, the cost of electrolytic coating method is cheaper than the other two. Therefore, the electrolytic coating method is another competent one on the surface modification.
|Appears in Collections:||材料科學與工程學系|
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