电沉积Fe-W-ZrO2纳米复合镀层的结构与腐蚀行为

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Fe 38.3%(w)、W52.7%(w)、ZrO₂ 9.0%(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0.5 mol·L^-1 H₂SO₄溶液中的耐蚀性较Fe-W非晶合金镀层明显提高.

Structure and Corrosion Behavior of Electrodeposited Fe-W-ZrO2 Nano-composite Coatings

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) NaCl and 0.5 mol·L^-1 H₂SO₄ solution at 30 ℃.