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表面发黑技术广泛应用于工具及机械零件的表面防护与装饰上。传统发黑工艺大多采用氢氧化钠与亚硝酸钠配成的碱性发黑剂,需经140℃以上加热氧化处理30～90min,不仅能耗大,生产周期长、工人劳动条件差,又含有亚硝酸类毒性物质,存在不少缺点。目前很多国家对此进行了研究,如美国Ingersoll-Rang公司用RT-S20常温发黑剂代替传统发黑工艺,可缩短生产时间50%,每年还可节省能源费2万美元以上;又如Chesco螺丝刀公司用其代替镀铬,克服了镀层经常剥落的疵病。我厂在无锡大学的协助下,采用了该校研制的H-845常温发黑
Surface black technology is widely used in surface protection and decoration of tools and mechanical parts. Most of the traditional blackening process using sodium hydroxide and sodium nitrite dubbed alkaline blackening agent, to be heated above 140 ℃ for 30 ~ 90min, not only energy consumption, long production cycle, poor working conditions, but also contains Nitrite toxic substances, there are many shortcomings. At present, many countries have studied this. For example, the United States Ingersoll-Rang RT-S20 room temperature blackening agents instead of the traditional blackening process, can shorten the production time 50%, annual energy savings of more than 20,000 US dollars; Another example Chesco Screwdrivers use it instead of chrome to overcome flaws that often flake off. I plant in Wuxi University with the help of the school developed H-845 room temperature blackening