Degradation of AISI304 stainless steel by atmospheric exposure in Saudi Arabia
Degradation of AISI304 stainless steel by atmospheric exposure in Saudi Arabia
复制标题
AISI304 不锈钢在沙特阿拉伯暴露于大气中的降解
DOI：
10.1179/174327808x286428
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
S. Syed
中科院分区：
文献类型：
--
作者：
S. Syed
AISI 304不锈钢是沙特阿拉伯工业和家用用途中吨位最大的合金材料。其主要性能决定了其在许多应用中的用途，即其在各种水性环境中的耐腐蚀性。本研究的目的是评估海洋和工业污染物对AISI 304大气降解的联合作用。通过失重法测定了暴露1年、2年、3年和4年后试样的腐蚀速率。还测定了湿润时间和大气污染物（Cl-和SO2）的沉积速率。ISO 9223大气侵蚀性标准适用于所使用的不同测试地点。实验结果与经验动力学方程C=Ktn吻合较好，其中K和C分别为暴露1年和t年后的腐蚀损失，单位为mg cm-2，n为常数。根据n值预测了AISI 304的腐蚀机理。使用X射线衍射进行腐蚀产物层的表征。结果表明，AISI 304的腐蚀速率是氯离子、SO2污染程度和潮湿时间的函数。
Stainless steel grade AISI304 is the largest tonnage alloy material used for industrial and domestic purposes in Saudi Arabia. The primary property, which determines its use in many applications, is its corrosion resistance in a wide variety of aqueous environments. The aim of this study is to evaluate the joint effect of marine and industrial pollutants on the atmospheric degradation of AISI304. The corrosion rate of specimens was determined after one, two, three and four years of exposure by weight loss. The time of wetness and deposition rates of atmospheric pollutants (Cl– and SO2) was also determined. The ISO 9223 standard for atmospheric aggressivity has been applied to the different test sites used. The results agreed well with the empirical kinetics equation of the form C=Ktn, where K and C are the corrosion losses in mg cm–2 after 1 and t years of the exposure respectively, and n is constant. Based on n values, the corrosion mechanism of AISI304 is predicted. Characterisation of the corrosion product layers was performed using X-ray diffraction. The results obtained show that the corrosion rate of AISI304 is a function of the chloride, SO2 pollution level and time of wetness.