How to carry out anti-corrosion treatment for auto

How to carry out anti-corrosion treatment for automotive spraying equipment?

What are the anti-corrosion methods for drying equipment in painting equipment? Most drying equipment consists of welded parts, flat plates, and cylinders. For the desiccant treatment of dryers for different purposes, the following describes some of the experience of drying equipment in material anti-corrosion and manufacturing methods.


1. Discussion on the welding of austenitic nickel-chromium stainless steel Many of the drying equipments are plate welded structural parts, and most of the plates are 1Cr18Ni9Ti (18-8 type). Corrosion, fracture and other problems often occur during the welding process. Seriously affect product life and performance. The difference between austenitic stainless steel and ordinary carbon steel is that the thermal conductivity is poor, the expansion coefficient is large when heated, and the resistance value is high. Due to these characteristics of austenitic steels, special welding processes are required for welding. Intergranular corrosion is one of the main problems of high alloy steel. This steel itself has high corrosion resistance, but the corrosion resistance is reduced during the welding process. Corrosion forms of austenitic steels during welding include: integral, local, and intergranular corrosion. A domestic factory introduces foreign drying equipment. The stainless steel frame of the bag filter has caused intergranular corrosion due to the improper welding method, which destroys the structure of the material. The material contains acidic components during the drying process, and the steel frame quickly breaks.

2.磷化——钝化工艺在振动流化床干燥机的制造中，有百分之七十的零件是碳钢结构。工序间周转时间较长，因此表面生成大量的铁锈，涂漆前需用较多的人工来除锈。磷化——钝化工艺，是通过电学和电化学反应，通过一次性处理，既可使生满铁锈的钢铁工件，表面呈现出金属的本来颜色，同时在金属表面生成致密的防锈膜层。可以在潮湿的空气中放置十几天，也不会锈蚀。它的操作方法简单，能改善作业环境，减轻劳动强度，节省人力物力。对磷化——钝化处理液中含有乳化剂、钼酸盐、可溶性磷酸盐和各种酸等，该方法不仅用在上述机型中，其它类似结构或机架都可以采用此法进行防腐处理。

3.静电粉末喷涂在干燥设备制造上的应用传统的油漆涂料是液态的，其中含有大量的酯酮及烃类等有机溶剂，给生产、储运、施工带来一系列麻烦，易燃易爆且很不安全。因有一定的毒性，挥发到大气中，严重地污染环境。因此，国内外的涂料专家们都在致力于开发少用溶液或不用溶液的新型涂料。这种新型涂料之一便是粉末涂料。
振动流化床干燥机的机上盖板，多是用冷轧不锈钢板制成的，因而成本很高。为什么用不锈钢而不采用普通碳钢，就因为该设备在工作状态会接触到各种腐蚀物料及气体，而不锈钢抗腐蚀性能非常优越，因而采用不锈钢冷轧板制成。
用普通碳钢进行静电喷涂聚酯树脂粉末涂料，其抗腐蚀能力完全与不锈钢相媲美。由于该种粉末涂料具有坚韧、耐久、装饰性好的特点，并具有卓越的室外耐候性和耐热性，同时具有卓越的耐腐蚀和耐粉化性能、卓越的光泽和色光性能，所以，静电粉末喷涂完全适用于干燥器壳体的防腐。