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切削液的极压添加剂通常均为氯化物、硫化物和磷化物等,其中,氯化物是使用得最多的一种。这种添加剂有下列缺点:①切削液老化后,产生酸性物质,易出现腐蚀问题;②对塑料及橡胶制品将产生极坏影响;③切削液残留在金属表面,将出现应力腐蚀现象。因此,宇航工业和其他一些工业部门早已禁止使用此类切削液。最近,欧洲,尤其是德国和瑞典等国,为防止环境污染,已限制使用氯化物添加剂。目前,有一些加工项目仍不得不使用含氯化物添加剂的切削液,如高合金的拉伸加工、拉削加工和一部分镗削加工,钛合金的切削加工等。但德国、瑞典、丹麦、
Extreme pressure additives cutting fluid are usually chloride, sulfide and phosphide, etc., of which, chloride is the most used one. This additive has the following disadvantages: ① cutting fluid aging, acidic substances, prone to corrosion problems; ② plastic and rubber products will have a very bad influence; ③ cutting fluid remaining on the metal surface, there will be stress corrosion. As a result, such cutting fluids have long been banned by the aerospace industry and some other industrial sectors. Recently, Europe, especially Germany and Sweden, have restricted the use of chloride additives to prevent environmental pollution. At present, there are still some processing projects still have to use cutting fluid containing chloride additives, such as high-alloy tensile processing, broaching and some boring, titanium machining. However, Germany, Sweden, Denmark,