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本文通过开路电位监测、动电位极化、交流阻抗曲线测定、静态浸泡腐蚀试验等方法,结合腐蚀形貌电镜观察,研究了Ti(C,N)-Ni/Cr金属陶瓷在1 mol/LHCl溶液中的腐蚀行为。试验结果表明:与粘结相全部为Ni的Ti(C,N)基金属陶瓷相比,添加4%Cr做粘结相后,使金属陶瓷的开路电位明显正移。而且可以明显减小其“伪钝化区”的维钝电流密度,扩大维钝区间;提高Ti(C,N)基金属陶瓷在HCl溶液中耐蚀性。其主要原因是由于Cr溶入粘结相Ni后,提高了粘结相的抗H+与Cl-腐蚀能力。
In this paper, the corrosion behavior of Ti (C, N) -Ni / Cr cermet in 1 mol / L HCl solution was studied by open circuit potential monitoring, potentiodynamic polarization, AC impedance curve test and static immersion corrosion test. In the corrosive behavior. The experimental results show that, compared with Ti (C, N) -based cermets with Ni as the binder phase, the open circuit potentials of the cermets are significantly shifted by adding 4% Cr as the binder phase. But also can significantly reduce the blunt current density in the “pseudo-passivation region” and enlarge the dimension-dull interval. The corrosion resistance of Ti (C, N) -based cermet in HCl solution is also improved. The main reason is due to Cr dissolved into the binder phase Ni, improve the binder phase of anti-H + and Cl-corrosion.