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以工业原材料制备的铁基非晶合金、镍铬合金、碳化钨颗粒的混合粉末为原材料,采用高速火焰喷涂技术制备铁基非晶基涂层。通过分析铁基非晶基涂层分别在1 mol/L盐酸、氯化钠、硫酸和氢氧化钠溶液中的动态极化特性,研究其腐蚀阻抗。采用扫描电子显微镜(SEM)分析涂层的腐蚀形貌。结果表明:铁基非晶基涂层具有优良的耐蚀性能,而且在含氯离子溶液中,表现出比304L奥氏体不锈钢更高的腐蚀阻抗。在1 mol/L盐酸溶液中,铁基非晶基涂层的腐蚀电流密度和钝化电流密度分别为132.0μA/cm2和9.0 mA/cm2,在1 mol/L氯化钠溶液中分别为2.5μA/cm2和2.3 mA/cm2,且表现出一个宽的自钝化区间。其优异的耐蚀性能表明铁基非晶基粉末可以作为一种耐腐蚀、耐磨损的工程材料。
Iron-based amorphous alloy prepared by using industrial raw materials, nickel-chromium alloy and tungsten carbide particles as raw materials is prepared by a high-speed flame spraying technique. The corrosion resistance of the iron-based amorphous coating was investigated by analyzing its dynamic polarization characteristics in 1 mol / L hydrochloric acid, sodium chloride, sulfuric acid and sodium hydroxide respectively. The corrosion morphology of the coating was analyzed by scanning electron microscopy (SEM). The results show that the iron-based amorphous coating has excellent corrosion resistance, and shows higher corrosion resistance than 304L austenitic stainless steel in chloride ion-containing solution. In 1 mol / L hydrochloric acid solution, the corrosion current density and passivation current density of the iron-based amorphous coating were 132.0μA / cm2 and 9.0 mA / cm2, respectively, in 1 mol / L sodium chloride solution, respectively 2.5 μA / cm2 and 2.3 mA / cm2, and showed a wide range of self-passivation. Its excellent corrosion resistance indicates that the iron-based amorphous powder can be used as a corrosion-resistant, wear-resistant engineering materials.