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首页> 外文期刊>International Journal of Electrochemical Science >Corrosion Behavior of Ni-Cr Based Coatings in Simulated Human Body Fluid Environment
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Corrosion Behavior of Ni-Cr Based Coatings in Simulated Human Body Fluid Environment

机译：Ni-Cr基涂层在模拟人体流体环境中的腐蚀行为

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Potentiodynamic polarization and linear polarization resistance electrochemical techniques were usedto assess the corrosion behavior of Ni20(% wt.)Cr, NiCrAl, NiCrAlY2O3, NiCrAlCoY2O3 and Cr2C3- Ni20Cr metallic coatings in simulated body fluid environment. Hanks solution was used forsimulating body fluid environment. Coatings were deposited on to AISI 304-type stainless steel by theHigh Velocity Oxygen Fuel (HVOF) system. All coatings were evaluated in the as deposited andgrinded with 600 grade emery paper conditions. Corrosion behavior of all coatings was affected byboth its chemical composition and surface finish. Scanning electron microscopy was used to observethe surface features of coatings before and after exposure in the corrosive media. Corrosion testsshowed that by adding Al to the NiCr coating system in the as deposited condition decreased itscorrosion potential whereas the corrosion current density (icorr ) increased in the order NiCrAl >NiCrAlYCo > Ni20Cr > NiCrAlY > Cr3C2(NiCr). Corrosion potential of coatings in the grindedcondition nobler than coatings in the as coated condition whereas the icorr value increased in the orderNiCrAlY > NiCrAlYCo > NiCrAl > Cr3C2(NiCr) > Ni20Cr. The coating with the highest pittingpotential value was NiCrAl, whereas the most susceptible to pitting type of corrosion wasCr3C2(NiCr). All coatings showed a crevice localized type of corrosion, and only NiCrAlY andCr3C2(NiCr) coatings showed a repasivation, protection potential.
机译：用电位动力极化和线性极化电阻电化学技术评估Ni20（％wt。）Cr，NiCrAl，NiCrAlY2O3，NiCrAlCoY2O3和Cr2C3-Ni20Cr金属涂层在模拟体液环境中的腐蚀行为。将汉克斯溶液用于模拟体液环境。通过高速氧气燃料（HVOF）系统将涂层沉积到AISI 304型不锈钢上。在沉积状态下用600级砂纸条件评估所有涂料。所有涂层的腐蚀行为都受到其化学成分和表面光洁度的影响。扫描电子显微镜用于观察涂层在腐蚀介质中暴露前后的表面特征。腐蚀试验表明，在沉积条件下向NiCr涂层体系中添加Al会降低其腐蚀电位，而腐蚀电流密度（icorr）则按NiCrAl> NiCrAlYCo> Ni20Cr> NiCrAlY> Cr3C2（NiCr）的顺序增加。磨削条件下涂层的腐蚀电位比原涂层条件下的涂层高，而icorr值按NiCrAlY> NiCrAlYCo> NiCrAl> Cr3C2（NiCr）> Ni20Cr的顺序增加。具有最高点蚀电位值的涂层是NiCrAl，而对点蚀最敏感的涂层是Cr3C2（NiCr）。所有涂层均表现出缝隙局部腐蚀，只有NiCrAlY和Cr3C2（NiCr）涂层具有修复和保护的潜力。

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