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    蒸發(fā)器管束用鋼管的耐蝕性研究

    Study on Corrosion Resistance of Steel Tube for Evaporator Pipe Bundle

    • 摘要: 碳鋼在拜耳法氧化鋁工藝中耐蝕性不足，通過添加Cr、Cu等元素研發(fā)低合金耐蝕鋼?；陲@微組織、機(jī)械性能、耐蝕性能等的綜合評估和分析表明，有別于A179碳鋼的球化態(tài)改善耐硫酸腐蝕性，BGNDMA和BGAABC低合金鋼合金化實現(xiàn)耐蝕性，熱軋態(tài)耐蝕性等效熱處理態(tài)，其組織仍均為碳鋼常規(guī)的鐵素體+珠光體。相比于20G和A179碳鋼，在60℃6%和10.3% H2SO4溶液中，BGNDMA和BGAABC低合金鋼耐蝕性至少提高4倍以上。在125℃，20% NaOH溶液中總體腐蝕率∧1.0 mm/a，BGAABC則∧0.1 mm/a，均未發(fā)生堿脆。

       

      Abstract: Since the corrosion resistance of carbon steel is insufficient in Bayer alumina process,the low alloy steel for corrosion resistance is developed by adding Cr,Cu and other elements.The comprehensive evaluation and analysis of micro-structure,mechanical property and corrosion resistance are carried out.The results show as follows:for improving corrosion resistance in dilute sulfuric acid,BGNDMA and BGAABC are low alloy steel,which corrosion resistance of hot rolled state is equivalent to that of heat treatment state,unlike spheroidized A179 carbon steel.The micro-structures of BGNDMA and BGAABC are still ferrite & pearlite like carbon steel.The corrosion resistance of BGNDMA and BGAABC in dilute sulfuric acid is at least four times higher than that of carbon steels such as 20G and A179 in 6% & 10.3% H2SO4 solution at 60℃.BGNDMA and BGAABC can completely replace 20G and A179 carbon steels in dilute sulfuric acid corrosion environment such as alumina industry.Corrosion rates of evaluated low alloy steels are lower than 1.0 mm/a in 20% NaOH solution at 125℃,while BGAABC is lower than 0.1 mm/a,and no alkali fragile occurs.

       

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