上海工程技术大学毕业设计-ND钢耐硫酸露点腐蚀的研究.doc

摘要 ND 钢，即09CrCuSb钢是目前国内外最理想的耐硫酸低温露点腐蚀用钢材ND 钢，09CrCuSb钢ABSTRACT ND Steel, the 09CrCuSb steel, is the best ‘low-temperature sulfuric acid dew point corrosion resistant steel’ at home and abroad. It is commonly used as metal Tube material in chemical equipment. When the ambient temperature is high, especially in acidic atmosphere, ND Steel is often affected by corrosion and reduced the service life, which greatly limits its application. This topic research ND Steel in corrosion characteristics, microstructure and electrochemical corrosion accelerated test. The experimental data discussed factors that affect the corrosion rate. Corroded six groups of ND steel sample. Analyzed the corrosion phase precipitates with XRD. Observed the configuration of ND Steel by optical microscope. Do electrochemical corrosion test at 20℃, at 10%, 20%, 30% H2SO4 solution. Through Tafel Plot and Linear Sweep Voltammetry, current and potential changes of the samples in this process can be analyzes. Experimental results show that, in the process of different 2Cr13 stainless steel corrosion, both with the rise of temperature, corrosion phenomena occur more easily. And the corrosion rate increases with the rise of temperature. The pitting on nucleation is began after new development but not corrosion hole. Corrosion and corrosion is formed after the hole can also can form the new development of corrosion hole. The pitting corrosion of narrow and deep hole cavitation erosion, and the crevice corrosion is broad and shallow holes in the electric dipole corrosion test. 2Cr13-Cu ，crevice corrosion occurred on average electric dipoles occasionally corrosion speed is greater than the electric dipole cast corrosion rate. 2Cr13 corrosion resistance of cast iron is better than, but in strong oxidizing environment corrosion resistant performance is not very good.? ? 更好的翻译建议 Keywords： ND Steel, 09CrCuSb steel, dew point corrosion, factors 目前能源问题变得越来越重要，增能节耗对目前能源紧缺的整个世界来说，无疑是一个急待解决的问题。就加热炉而言， 国内外为了提高其热效率