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以0.4 mol/L Al(NO_3)_3乙醇溶液为电解液,用阴极微弧电沉积方法在304不锈钢表面制备了80μm厚的氧化铝膜层。分析了膜层的形貌、成分和相组成,测试了膜层的抗高温氧化和电化学腐蚀性能。结果表明.电沉积膜层由γ-Al_2O_3和α-Al_2O_3组成。膜层中含有少量的Fe、Cr、Ni元素,表明膜/基界面附近的不锈钢基体在微弧放电作用下也参与氧化铝膜层的沉积和烧结过程。氧化铝膜层使不锈钢在800℃恒温氧化速率明显降低,表明其抗高温氧化性能得到提高。同时,其腐蚀电位正向移动,腐蚀电流密度降低1个数量级,表明其耐腐蚀性能得到提高。
A 0.4μmol / L Al (NO_3) _3 ethanol solution was used as the electrolyte to prepare a 80μm thick aluminum oxide film on the surface of 304 stainless steel by cathodic micro-arc electrodeposition. The morphology, composition and phase composition of the film were analyzed. The high temperature oxidation and electrochemical corrosion resistance of the film were tested. The results show that the electrodeposited film consists of γ-Al 2 O 3 and α-Al 2 O 3. The film contains a small amount of Fe, Cr and Ni elements, indicating that the stainless steel substrate near the film / substrate interface also participates in the deposition and sintering of the alumina film under the action of micro-arc discharge. The oxidation rate of stainless steel at 800 ℃ is obviously decreased by the aluminum oxide film, which indicates that the high temperature oxidation resistance of stainless steel is improved. At the same time, the corrosion potential moves forward and the corrosion current density decreases by one order of magnitude, indicating that the corrosion resistance is improved.