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本文通过化学热处理的方法——硼氮共渗,来改变碳钢与铸铁表层的化学成份,改善表层的组织结构和提高电极电位,从而获得耐酸腐蚀层。通过一系列热处理工艺,耐酸腐蚀试验和金相分析,确定了最佳的硼氮共渗剂配方及处理工艺。灰口铸铁的片状石墨尺寸小于四级时,硼氮共渗可显著提高其耐酸腐蚀性能;普通碳钢处理后,在常温下,能承受不同浓度的盐酸、硫酸的腐蚀。因此,在适当条件下,可用它来代替部分不锈钢,节约稀贵的镍铬合金。
In this paper, the method of chemical heat treatment - boron nitrided to change the chemical composition of the surface of carbon steel and cast iron to improve the surface structure and improve the electrode potential, resulting acid corrosion layer. Through a series of heat treatment process, acid corrosion test and metallographic analysis to determine the best boron nitride infiltration formula and treatment process. When graphite flake size of gray cast iron is less than four grades, boronitri-nitrification can obviously improve its acid corrosion resistance. After ordinary carbon steel is processed, it can withstand the corrosion of hydrochloric acid and sulfuric acid at different concentrations under normal temperature. Therefore, under appropriate conditions, it can be used to replace part of the stainless steel, saving rare nickel-chromium alloy.