论文部分内容阅读
铝及其合金的硬钎焊剂传统均以氯盐基钎剂占主导地位。这类钎剂一般以氯化锂一氯化钠系统为基础,加入一至两种氯盐或氟盐的低熔点盐,即可制成进行钎焊的钎剂。但是该类针剂存在着氯等卤离子对母材的强烈电化学腐蚀,吸湿性很强。在钎焊区,焊后残渣吸潮后会严重腐蚀钎焊件,加热过程容易水解导致钎剂性能变坏,甚至失效。此外,焊后对残留物的清洗要求较高,未能彻底清洗的残留物是工件焊区锈蚀的严重隐患。
Traditionally aluminum and its alloys have been dominated by chloride-based fluxing agents. Such flux is generally based on lithium chloride sodium chloride system, adding one or two salts of low melting point chloride salt or fluoride salt can be made brazing flux. However, there is a strong electrochemical corrosion of this kind of injection such as chlorine and other halide ions on the base metal, hygroscopicity is very strong. In the brazing zone, after welding slag residue moisture will seriously corrode the brazing pieces, heating process easily lead to deterioration of flux performance, or even failure. In addition, the residue after the welding cleaning requirements are higher, the residue can not be thoroughly cleaned of workpiece pad corrosion serious hidden danger.