Surface characterisation and corrosion behaviour of niobium treated in a Ca- and P-containing solution under sparking conditions
Surface characterisation and corrosion behaviour of niobium treated in a Ca- and P-containing solution under sparking conditions
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DOI：
10.1016/j.electacta.2016.03.069
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发表时间：
2016-04
影响因子：
6.6
通讯作者：
Maciej Sowa;Joanna Worek;G. Dercz;D. M. Korotin;A. Kukharenko;E. Kurmaev;S. Cholakh;M. Basiaga
中科院分区：
文献类型：
--
作者：
Maciej Sowa;Joanna Worek;G. Dercz;D. M. Korotin;A. Kukharenko;E. Kurmaev;S. Cholakh;M. Basiaga
研究了铌在1.5 mol dm−3Ca(H2PO2)2和0.5 mol dm−3Mg(CH3COO)2溶液中，在恒阳极电流密度为150 mA cm−2至若干极限电压（200、300、400和500 V）下的等离子体电解氧化（PEO）过程。在37.0±0.5°C的林格氏溶液中，根据其物理化学性质和耐腐蚀性（直流和交流技术）对所得氧化层进行了表征。用数码相机监测了氧化层在PEO处理过程中的生长情况，并分析了铌表面产生的火花。阳极氧化电压对氧化层厚度（从小于1 μm增加到150 μm）、电解质溶液组分的掺入（镀层中Nb的相对含量从36.5下降到0.7 %）、附着力（thelc2从6.31±0.38增加到14.10±0.47 N）和耐蚀性（ther4从10.4±2.7增加到60.9±13.7 MΩ cm2）的影响。此外，还研究了氧化层的物相和化学组成。
The investigations of plasma electrolytic oxidation (PEO) process of Nb in a 1.5 mol dm−3Ca(H2PO2)2and 0.5 mol dm−3Mg(CH3COO)2solution at a constant anodic current density of 150 mA cm−2up to several limiting voltages (200, 300, 400 and 500 V) were described. The resulting oxide layers were characterised in terms of their physicochemical properties and corrosion resistance (DC and AC techniques) in Ringer’s solution at 37.0 ± 0.5 °C. The growth of the oxide layers during the PEO treatment was monitored using a digital camera and the sparks formed on the surface of niobium were analysed. The effect of the anodisation voltage on the oxide layer thickness (from less than 1 μm up to 150 μm), incorporation of the electrolyte solution species (the relative content of Nb in the coatings dropped from 36.5 to 0.7 at%), adhesion strength (theLc2increased from 6.31 ± 0.38 to 14.10 ± 0.47 N) and corrosion resistance (theRpchanged from 10.4 ± 2.7 to 60.9 ± 13.7 MΩ cm2) was described. Additionally, the phase and chemical compositions of the oxide layers were studied.