合金元素对碳钢和低合金钢在大气中耐腐蚀性的影响

THE EFFECT OF ALLOYING IN CARBON STEELS AND LOW ALLOY STEELS ON THEIR ATMOSPHERIC CORROSIONRESISTANCE

对我国七个试验点十七种钢的八年大气腐蚀试验数据用动力学公式D=At^n作了回归处理,用逐步回归方法获得了主要合金元素含量与公式中系数A_1n的关系式,探讨了合金元素对碳钢和低合金钢在大气中耐腐蚀性的影响。磷、铜提高钢的耐大气腐蚀性能;硫急剧降低钢的耐大气腐蚀性;硫、磷含量在很小范围内即有明显作用。与一般概念相反,硅能提高钢的耐大气腐蚀性能,铬、镍的影响不大。

Data from 8 years atomspheric exposure of 17 steels at 7 sites in China were analyzed by means of regression. The coefficients A and index n in kinetics formula D = Atn were defined as a linear function of alloy content in the steels. The coefficients of the function were determined by multivariant stepwise linear regression. Effect of alloying elements was quantitatively demonstrated. Significant effect of copper, phosphor and sulphur content in trace amount was observed. The usually assumed good effect of chromium and nickel was not obvious. However, the content of silicon, which was usually thought as of weak effect, displayed a considerably important role, especially in humid hot environment.