电沉积Fe-W-ZrO_2纳米复合镀层的结构与腐蚀行为

Structure and Corrosion Behavior of Electrodeposited Fe-W-ZrO_2 Nano-composite Coatings

采用复合电沉积工艺制备了Fe-W-ZrO2纳米复合镀层.分别用扫描电子显微镜(SEM)、扫描电子显微镜附带能谱仪(EDS)、X射线衍射(XRD)、恒电位仪等技术较系统地研究了Fe-W-ZrO2纳米复合镀层的表面形貌、成分、结构、硬度和耐蚀性.结果表明,复合镀层的质量组成为Fe38.3%(w)、W52.7%(w)、ZrO29.0%(w)时,在ZrO2纳米粒子的弥散强化作用下,Fe-W非晶合金镀层的裂纹状况得到明显改善,而且复合镀层成分分布均匀,组织致密,结构呈现明显的非晶态特征;复合镀层比Fe-W合金镀层有更高的显微硬度;30℃下,Fe-W-ZrO2纳米复合镀层在3.5%(w)NaCl和0.5mol·L-1H2SO4溶液中的耐蚀性较Fe-W非晶合金镀层明显提高.

New Fe-W-ZrO2 nano-composite layers were prepared by composite electrodeposition technology. The morphology, composition, structure, hardness and corrosion resistance properties of the coatings were systematically characterized by means of SEM, EDS, X-ray diffraction and potentiostat methods. The results showed that when the mass composition of the obtained Fe-W-ZrO2 composite coating was Fe 38.3%（w）,W 52.7%（w）,ZrO2 9.0%（w）, the crack condition of Fe-W alloy coatings was improved markedly by the dispersion strengthening effect of the ZrO2 nano-particle. Meanwhile, the composite coatings presented an obvious amorphous characteristics, compact structure, and uniform composition. In comparison with Fe-W alloy coatings, not only the hardness of the composite coatings was higher, but also the corrosion resistance was enhanced evidently in 3.5%（w） NaC1 and 0.5 mol·L^-1 H2SO4 solutions at 30℃.