摘要：不锈钢是一种在燃料电池中被广泛所使用的一种金属。不锈钢因在钢的内部加入铬，镍，钼等元素，使得原本不耐蚀的钢，耐蚀性能产生显著性的提高。然而在不锈钢的生产中，需要用到许多的镍等贵金属，而世界上镍的产量不足以支撑现代大量的不锈钢消费。在不锈钢中加入氮元素，能够使不锈钢的性能与强度得到大幅度的提升。

本实验通过采用电化学工作站测试电位极化的情况，EIS阻抗测试，Mott-Schottky曲线，来测试燃料电池用高氮钢在pH为1、2、3、5的质子交换膜燃料电池（PEMFC）中的模拟腐蚀环境下，高氮钢的电化学行为和钝化膜性质。发现随着pH值的增加，钝化膜会钝化电位会升高并且钝化电流密度也会随之减小，钝化膜的阻值会随着pH值的增大而增大。通过XPS技术分析，我们可以分析出钝化膜表面的物质结构，随着pH值的降低，高氮钢表面的氧化物明显增多，说明在酸性溶液中会产生大量的氧化物。氮元素在不锈钢中能够有效提高耐腐蚀性能，是一种很好的不锈钢的添加元素，高氮钢作为一种普通不锈钢的替代物，具有很好的使用和推广前景。

关键词：燃料电池；高氮钢；钝化膜；pH值；电化学测试

abstract：Stainless steel is a metal which is widely used in fuel cells. Stainless steel due to the steel by adding the internal chromium, nickel, molybdenum and other elements, making the original corrosion resistance of the steel produced a significant increase. However, in the production of stainless steel, it need to use a lot of nickel and other precious metals, and the world's nickel production is not enough to support a large number of modern stainless steel consumption. Adding nitrogen in the stainless steel can make the performance and strength of stainless steel been greatly improved.

In this experiment, the use of electrochemical workstation test potential polarization, EIS impedance test, Mott-Schottky curve, to test the fuel cell with high nitrogen steel at pH 1,2,3,5 proton exchange membrane fuel cell (PEMFC) Electrochemical Behavior and Passivation Film Properties of High Nitrogen Steel in Simulated Corrosive Environment. It was found that with the increase of pH value, the passivation film increased the passivation potential and the passivation current density decreased, and the resistance of the passivation film increased with the increase of pH value. Through XPS analysis, we can analyze the material structure of the surface of the passivation film, with the decrease of pH value, the surface oxide of the high nitrogen steel is obviously increased, which indicates that a large amount of oxide will be produced in the acidic solution. Nitrogen in the stainless steel can effectively improve the corrosion resistance, is a very good addition of stainless steel elements, high nitrogen steel as a substitute for ordinary stainless steel, has a good use and promotion prospects.

Keywords: Fuel cell; high nitrogen steel; passivation film; pH value; electrochemical test

目录

摘 要 I

abstract II

第一章绪论 1

1.1本课题的实验背景 1

1.2燃料电池的现状与发展 1

1.2.1燃料电池的发展背景 1

1.2.2燃料电池的分类及发展 2

1.2.3燃料电池的工作原理 2

1.2.4燃料电池性能比较 4

1.3高氮钢的发展情况 4

1.4pH对金属双极板的影响