氟化锂氟化钕熔盐环境下低碳钢表面渗铝后耐蚀性的测试.docVIP

题 目：LiF-NdF3熔盐环境下低碳钢表面渗铝后耐蚀性的测试 学生姓名： 学 号： 专 业： 班 级： 指导教师： LiF-NdF3熔盐环境下低碳钢表面渗铝后耐蚀性的测试 摘 要 随着近几年稀土金属钕需求的不断提高，国内生产的稀土钕的厂家也多了起来，但是生产的方法没有太多的发展，依然采用以前的稀土钕生产工艺，也就是最传统的火法工艺，火法工艺简单来说就是阴极置换得到金属钕。由于电解生产钕的过程中，弧状阳极压板在高温氟化物环境下腐蚀，造成产品中铁的含量超标，且阳极压板的使用寿命只有17天左右，故本文采用合适的渗铝工艺对20钢进行渗铝，并对渗铝20钢在高温LiF-NdF3熔盐环境下进行了850℃、950℃不同时间的热腐蚀实验，通过实验中反应的不用时间温度腐蚀产物的类型、腐蚀速率在不用时间温度下的变化规律以及减重动力学曲线，使得渗铝20钢阳极压板能替代原有的20钢阳极压板，提高其使用寿命，降低生产成本。 关键词：20钢阳极压板；渗铝工艺；热腐蚀；耐蚀性能 In the lithium fluoride and neodymium fluoride molten salt environment was carried out on the surface of aluminized low carbon steel corrosion resistance test Abstract Due to the continuous improvement of rare earth neodymium metal demand in recent years, domestic production of rare earth neodymium manufacturer also more up, but the development of production methods are not too much, still the old production process of rare earth neodymium, which is the most traditional technology of fire, fire process is simply the cathode replacement metal neodymium. Because in the process of electrolysis production of neodymium, arc anode plate corrosion under high temperature of fluoride, iron caused by excessive levels, and the service life of anode plate only 17 days or so, so this article use appropriate alumetizing technology for 20 aluminized steel, and the aluminized 20 steel under the environment of high temperature LiF - NdF3 molten salt hot corrosion experiment, through the experiment in the reaction of no time temperature corrosion products of the type, the corrosion rate in no time temperature change rule and weight reduction kinetics curves of the aluminized 20 steel anode plate can replace the original 20 steel anode plate, improve its service life, reduce the production cost. Key words: 20 steel electrode; Alumetizing technology; Hot corrosion; Corrosion resistance 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc454035610 摘 要 PAGEREF _Toc454035610 \h I HYPERLINK \l _Toc454035612 Abstract PAGEREF _Toc454035612 \h II HYPERLINK \l