Corrosion of carbon steel and cast iron in gas phase above salt melts used in magnesium industry

I. Komelin, A. P. Lysenko, D. S. Kondrat’eva
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Abstract

Corrosion tests of SCh15 cast iron, Steel 3 and Steel 3 with aluminized coating in some compositions of 10%MgCl2-KCl-NaCl and 10%MgCl2-KCl-Naa-Caa2 salt melts with 10 %, 25 % and 40 % CaCl2 concentrations, and also in 10MgCl2-45%KCl-20%NaCl-25%NaBr melt, and in the gas phase above these melts at 700 °C. A gravimetric method was used to determine corrosion rates of metal samples. Chemical analysis of absorption solutions was used to determine concentrations of halide and hydrogen halide impurities in air blown through the reactor with melts and samples. It was shown that carbon steel aluminizing can reduce the corrosion rate in the gas phase over the salt melt by a factor of 5 to 70. The formation mechanism of gases aggressive in relation to carbon steel and cast iron in atmospheric air in contact with salt chloride melt was considered. Accelerated hydrogen chloride and chlorine formation during the salt melt interaction with atmospheric air under the influence of iron corrosion products was found.
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镁工业中碳钢和铸铁在盐熔体上气相的腐蚀
在10%、25%和40% CaCl2浓度的10%MgCl2-KCl-NaCl和10%MgCl2-KCl-Naa-Caa2盐熔体以及10MgCl2-45%KCl-20%NaCl-25%NaBr熔体中,以及在700℃以上这些熔体的气相中,对镀铝涂层的SCh15铸铁、3号钢和3号钢进行腐蚀试验。用重量法测定了金属样品的腐蚀速率。吸收溶液的化学分析用于测定带熔体和样品吹过反应器的空气中卤化物和卤化氢杂质的浓度。结果表明,碳钢渗铝可使盐熔液气相腐蚀速率降低5 ~ 70倍。研究了大气中与氯化盐熔体接触的碳钢和铸铁腐蚀性气体的形成机理。发现在铁腐蚀产物的影响下,盐液与大气相互作用时加速了氯化氢和氯的形成。
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