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OALib Journal期刊
ISSN: 2333-9721
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铁基非晶涂层在NaCl和H2SO4溶液中的钝化行为
DOI: 10.11900/0412.1961.2014.00272, PP. 49-56
Keywords: 非晶涂层,超音速火焰喷涂,钝化,电化学腐蚀
Abstract:
采用超音速火焰喷涂(HVOF)方法制备了一种FeCrMoMnWBCSi非晶态合金涂层,测试并分析了非晶涂层组织、钝化膜成分及涂层在不同浓度NaCl和H2SO4介质中的钝化行为,并与304不锈钢和ND钢进行对比.结果表明,非晶涂层由于钝化膜中高含量的Cr,Mo及W的氧化物,钝化区间宽,抗钝化膜破裂能力强,孔隙的存在降低其均匀腐蚀抗力.304不锈钢钝化膜破裂电位较低且与NaCl溶液浓度密切相关.304不锈钢和ND钢只有在浓H2SO4溶液中具有较稳定的钝化特征,非晶结构有助于涂层在稀H2SO4溶液中形成更加稳定的钝化膜,厚度较小的涂层(200μm)具有较高的非晶相含量,形成的钝化膜较厚,耐蚀性更加优异.
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