热处理对Fe基非晶涂层耐磨及耐腐蚀性能的影响

Effect of heat-treatment on wear resistance and corrosion resistance of Fe-based amorphous coatings

采用超音速火焰喷涂(HVOF)制备了(Fe_(0.5)Ni_(0.2))_(61)Cr_(9)Co_(6)Si_(1.5)B_(17.5)Nb_(5)非晶涂层,探究了不同热处理温度和时间对非晶涂层的磨损性能和腐蚀性能的影响。利用X射线衍射仪(XRD)、同步热分析仪(DSC)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、高速往复摩擦磨损试验机、电化学工作站等仪器对涂层组织结构及相应的性能进行检测。结果表明:随着热处理温度和时间的增加,涂层仍保持非晶态,涂层孔隙率降低,涂层表面氧化磨损和剥层磨损减轻,磨痕表面更加平整;在人工海水溶液中有更宽的钝化区间和低的钝化电流密度(J_(pass)),热处理后的非晶涂层耐磨、耐腐性能得到改善提升。在480℃保温1110 min时,涂层出现FeNi_(3)纳米晶体相,涂层的最低孔隙率为0.6%,磨损率为1.6×10^(−5)mm^(3)/(N∙m),且涂层具有最低的自腐蚀电流密度(J_(corr))4.591×10^(−8)A/cm^(2)。

The amorphous coating with composition of(Fe_(0.5)Ni_(0.2))_(61)Cr_(9)Co_(6)Si_(1.5)B_(17.5)Nb_(5)was prepared by high velocity oxy fuel(HVOF),and the effects of different heat-treated temperatures and times on the structure,wear and corrosion properties were explored.The structure corresponding properties of coating were analyzed by X-ray diffractometer(XRD),differential scanning calorimetry(DSC),transmission electron microscope(TEM),scanning electron microscope(SEM),wear test machine and electrochemical workstation etc.The results show that with the heat-treated temperatures increasing,the coatings remain amorphous structure,the porosity of the coatings decreases,the oxidation wear and delamination wear of the coatings surface reduce,and the wear scar surface of coating is smoother.The heat-treated amorphous coatings exhibit a wider passive region and low passive current density(J_(pass))in the artificial seawater solution,and the wear resistance and corrosion resistance of the amorphous coatings are improved.The FeNi_(3) nanocrystalline phase appears in the amorphous coating after heat-treatment at 480℃for 1110 min.The coating has the lowest porosity of 0.6%,the wear rate of 1.6×10^(−5)mm^(3)/(N∙m),and the lowest self-corroding current density(J_(corr))of 4.591×10^(−8)A/cm^(2).