电流密度对光亮镍-铁合金镀层表面形貌及耐蚀性的影响

The Effects of Current Density to Surface Morphology and Corrosion Resistance of Bright Ni-Fe Alloy Coating

通过电沉积方法制备光亮镍-铁合金镀层,利用扫描电镜测定镀层表面显微形貌（SEM）,X射线衍射仪测定合金镀层的相结构（XRD）,然后对合金镀层进行浸泡腐蚀实验,观察其腐蚀行为,并测定其腐蚀速率。结果表明：镍-铁合金镀层在质量分数为3.5%的NaCl溶液中的腐蚀速率较在质量分数为5%的H2SO4溶液中的腐蚀速率小,即：在质量分数为3.5%的NaCl溶液中有较好的耐蚀性,最小的腐蚀速率为0.21 mg/（dm^2·h）,且在电流密度为4～6 A/dm^2工艺条件下获得的合金镀层在两种溶液中都具有较好的耐蚀性能。

Bright Ni-Fe alloy coating was prepared using electrodeposited method. The microstructures of the alloy coating was determined by scanning electron microscope （SEM）; the phase compositions of the alloy coating was analyzed by X-ray diffraction（XRD）; and immersion corrosion testing was then done on the alloy coating to observe the corrosion behavior and corrosion rate. The results show that the corrosion rate of alloy coating in 3.5 % NaCl solution is slower than in 5 % H2SO4 solution, and the better corrosion resistance is manifested in 3. 5% NaCl solution. The smallest rate of corrosion is 0. 21 mg/（dm^2 · h）, and alloy coatings have a better corrosion resistance in each of solution when current density is 4-6 A/dm^2.