Influence of treating frequency on microstructure and properties of Al2O3 coating on 304 stainless steel by cathodic plasma electrolytic deposition
Influence of treating frequency on microstructure and properties of Al2O3 coating on 304 stainless steel by cathodic plasma electrolytic deposition
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DOI：
10.1016/j.apsusc.2009.06.069
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发表时间：
2009-08
影响因子：
6.7
通讯作者：
Yunlong Wang;Zhaohua Jiang;Xinrong Liu;Zhongping Yao
中科院分区：
文献类型：
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作者：
Yunlong Wang;Zhaohua Jiang;Xinrong Liu;Zhongping Yao
采用阴极等离子体电解沉积（CPED）技术在304不锈钢表面制备了氧化铝陶瓷涂层。研究了电源频率对涂层组织和性能的影响。结果表明：304不锈钢在不同频率下获得的涂层均由α-Al 2 O3和γ-Al 2 O3组成，其中α-Al 2 O3为主要相。随着频率的增加，α-Al 2 O3含量逐渐减少，但幅度很小，γ-Al 2 O3含量逐渐增加。氧化铝陶瓷涂层表面多孔。随着频率的增加，涂层表面逐渐变得不那么粗糙，变得更加致密，导致表面粗糙度降低。Al_2O_3涂层的结合强度大于22 MPa，且不受处理频率的影响。在3.5%NaCl溶液中，随着频率的增加，氧化铝涂层钢的耐蚀性逐渐提高。在800 Hz下，腐蚀电流电位为-0.237V，腐蚀密度为7.367×10 - 8A/cm 2，具有良好的耐蚀性。
Alumina ceramic coatings were fabricated on 304 stainless steel by cathodic plasma electrolytic deposition (CPED). Influence of treating frequency of the power supply on the microstructure and properties of the coatings were studied. The results indicated that coatings obtained at various frequencies on 304 stainless steels were all composed of α-Al2O3and γ-Al2O3, and α-Al2O3was the dominant phase. The contents of α-Al2O3decreased gradually in a very small rate with increasing the frequency and γ-Al2O3gradually increased. The surface of alumina ceramic coating was porous. With increasing the frequency, the coating surface gradually became less rough and more compact, resulting in low surface roughness. The bonding strength of Al2O3coating was higher than 22MPa and was not strongly affected by treating frequency. With increasing the frequency, the alumina coated steels showed better and gradually increasing corrosion resistance than the uncoated one in 3.5% NaCl solution. The coating steel with desirable corrosion resistance was obtained at 800Hz whose corrosion current potential and corrosion density were −0.237V and 7.367×10−8A/cm2, respectively.