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在碳钢表面实施等离子渗Ti,然后进行离子氮化。将处理试样在1 mol/L HNO3溶液中用PS-268A型电化学测量仪进行耐腐蚀实验,并采用SEM对腐蚀试样表面进行分析。结果表明:在1 mol/L HNO3酸性溶液中,渗Ti、渗Ti+离子氮化试样的致钝电位较未处理碳钢试样明显降低,钝化电位区间分别比未处理碳钢提高3.17倍和2.96倍,试样耐腐蚀性能分别比未处理试样提高7.44倍和4.54倍;腐蚀机理为:未处理碳钢腐蚀后表面形貌表现为较大的腐蚀坑且凸凹和起伏较明显,是典型的孔蚀;渗Ti试样为轻微面腐蚀;渗Ti+离子氮化试样腐蚀机理表现为典型的晶间腐蚀。
Plasma-infiltration Ti is performed on the surface of the carbon steel, followed by ion nitriding. The samples were treated in 1 mol / L HNO3 solution with a PS-268A electrochemical measuring instrument for corrosion resistance test, and the surface of the corrosion specimen was analyzed by SEM. The results show that in 1 mol / L HNO3 acid solution, the blunt potentials of the samples infiltrated with Ti and infiltrated Ti + ions are significantly lower than those of untreated carbon steel, and the passivation potential range is 3.17 times higher than untreated carbon steel And 2.96 times, respectively. The corrosion resistance of the sample increased by 7.44 times and 4.54 times than that of the untreated sample respectively. The corrosion mechanism was as follows: the surface morphology of the untreated carbon steel showed larger corrosion pits and obvious bump and undulation Typical pitting corrosion; Ti seepage sample for the slight surface corrosion; infiltration Ti + ion nitriding sample corrosion mechanism is typical intergranular corrosion.