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采用快速划伤法对18-8Ti、316L不锈钢和Incoloy800合金在氯化钠溶液中的裸表面临界点蚀电位E_c进行了精确的测量。分析了金属裸表面上点蚀的形成机理,指出了裸表面临界点蚀电位的物理意义。研究表明,E_c与氯离子浓度成半对数关系。比较并分析了E_c与动电位法测得的点蚀击破电位E_b、保护电位E_p之间的关系。研究表明,E_c与E_b在不同pH值的氯化钠溶液中表现出相同的变化规律,并通过测得再钝化系数的变化规律来说明pH值对E_c和E_b的影响。
The critical pitting potential E_c of bare surface of 18-8Ti, 316L stainless steel and Incoloy800 alloy in sodium chloride solution was measured by rapid scratching method. The formation mechanism of pitting corrosion on bare metal surface is analyzed, and the physical meaning of the critical pitting potential of bare surface is pointed out. Studies have shown that, E_c and chloride ion concentration into a semi-logarithmic relationship. The relationship between E_c and potential E_p and potential E_p was compared and analyzed. The results show that E_c and E_b show the same variation in sodium chloride solution with different pH value, and the effect of pH value on E_c and E_b can be illustrated by measuring the law of reactivation coefficient.