发黑被广泛用于要求防蚀的机械零件,亦可用作零件的装饰保护层。多年来,一般均采用传统的碱性煮黑工艺,环境污染严重。钢铁回火余热发黑剂(简称TG-463)是新近研制成功的科技成果,克服了碱性煮黑工艺中存在的缺点,不存在废气、废水和亚硝酸钠等有害物质,无环境污染,已在很多单位推广使用,获得良好的效果和较大的经济效益。 1.组分及用途 Black is widely used in mechanical parts that require corrosion protection and can also be used as a decorative cover for parts. Over the years, the traditional alkaline cooking black process is generally used, causing serious environmental pollution. Iron tempering residual heat blackening agent (referred to as TG-463) is a newly developed scientific and technological achievements to overcome the shortcomings of alkaline cooking black process, there is no exhaust, waste water and sodium nitrite and other harmful substances, no environmental pollution, Has been promoted in many units to obtain good results and greater economic benefits. 1. Components and uses