电弧喷涂高性能防腐耐磨涂层

Wire Arc Sprayed High Quality Anti-Corrosion and Wear-Resistant Coatings

垃圾焚烧厂工件表面通常暴露在含HCl/KCl的高温气氛中,这些高腐蚀性高温气氛是造成焚烧厂高额维护费用的主要原因。使用热喷涂技术对部件表面进行涂层防护可明显提高传统钢材的表面耐腐蚀性能。电弧喷涂由于其易于操作性和低成本,已成为最为成熟的技术之一。要得到可观的腐蚀防护能力,涂层必须有很高的致密度。因此,电弧喷涂必须做出适当调整以适应垃圾焚烧厂的特殊需求。虽然镍基合金和钴基合金代表了当今腐蚀防护的技术水平,但是这些合金非常昂贵。属于同一系列的铁基合金将成为一种经济效益更为可观的防腐蚀材料。最近的研究表明,与铁铬基合金和镍铬基合金相比,铁基合金中加入硅后其耐腐蚀性能得到显著提高。鉴于这一原因,本文开展了对不同成分的铁-铬-硅系合金的研究,重点讨论了该合金的最新研究结果。

Surfaces of parts in waste incineration plants are normally exposed to high temperatures of service in atmospheres containing HCl and KCl. The high corrosiveness of these gases is the main reason for high maintenance costs of the incinerators. However, the use of spraying processes to coat surfaces of parts make possible to improve significantly the corrosion-resistance on surfaces of conventional steels. Due to its easy handling and low operating costs wire arc spraying has become one of the most established processes. But to realize appropriate corrosion protection, dense coatings are essential. Therein, the wire arc spray process has to be adapted to the special requirements of waste incineration plants. For corrosion protection Ni- and Co-based alloys are state of the art. However, these alloys are really expensive. Therefore, the substitution of these materials for Fe-based alloys will lead to a notable economic benefit. Latest research activities proved that addition of silicon raises the corrosion resistance of iron based alloys, compared to FeCr- and NiCr-based alloys. For this reason, different Fe-Cr-Si-materials are part of the investigation of this work. This paper deals with the first results of the alloy develpoment.