材料期刊网

为了改善多孔泡沫镍合金的耐高温腐蚀性能，在其表面共沉积Ni-Fe-Cr合金镀层．采用共沉积法制备耐热多孔泡沫合金，研究工艺参数对Ni-Fe-Cr合金镀层中Cr、Fe质量分数的影响，利用能量色射谱仪、X射线衍射仪、金相显微镜及扫描电子显微镜分别对镀层成分、微观结构及其形貌进行分析，采用ICP-OES电感耦合等离子体光谱2100Dv测定合金中Cr、Fe的质量分数，同时对Ni-Fe-Cr多孔泡沫合金试样进行了抗热冲击性和耐热性能测试．结果表明：共沉积优化工艺参数为CrC13·6H2 O 160 g/L，FeC12·4H2 O 9 g/L，阴极电流密度24 A/dm2，镀液pH值2．0，温度30℃；在优化参数下，电镀30 min，得到Cr质量分数为21．2％、Fe质量分数为43．9％的Ni-Fe-Cr多孔泡沫合金．经测试，Ni-Fe-Cr多孔泡沫合金表面由紧密排列的球形颗粒组成，并形成了面心立方微观结构，具有良好的抗热冲击性及耐热性．

Ni-Fe-Cr alloy coatings were deposited on the surface of porous foam nickel in order to improve the performance of it which included heat and corrosion resistance properties. Porous Ni-Fe-Cr foam alloys prepared by electro-deposition under different electroplating conditions, the effects of concentration of CrC13·6H2 O and FeCl2·4H2O, current density, pH value and temperature of plating solution on the compositions of the coatings were studied by energy dispersive spectrometer, and the microstructure and surface morphologies of the coatings were observed by X-ray diffraction spectroscopy, optical microscopy and scanning electron microscope. Cr and Fe contents of the coatings were precisely determined by ICP-OES, and the thermal shock and heat-resistance properties of the porous foam alloys were tested. Experiment results show that the Ni-Fe-Cr alloy coating layer by a dense arrangement and a face centered cubic structure which has good thermal shock and heat resistance properties with 21.2 wt% Cr and 43.9 wt% Fe is obtained using the solution containing 160 g/L of CrC13·6H2 O and 9 g/L of FeCl2·4H2 O with pH value of 2.0 and current density of 24 A/dm2 at 30℃ for thirty minutes.