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      发蓝处理是一种化学表面处理,其主要作用是在工件表面形成一层致密的氧化膜,防止工件腐蚀上锈,提高工件的耐磨性,它只是一种表面处理,不会对内部组织产生任何的影响,它不是热处理,和淬火有根本的区别。
      发黑处理现在常用的方法有传统的碱性加温发黑和出现较晚的常温发黑两种。但常温发黑工艺对于低碳钢的效果不太好。 碱性发黑细分出来，又有一次发黑和两次发黑的区别。发黑液的主要成分是氢氧化钠和亚硝酸钠。发黑处理时所需温度的宽容度较大，大概在135到155℃之间都可以得到不错的表面，只是所需时间有些长短而已。

Bluing is a kind of chemical surface treatment, its main function is formed in the surface layer of dense oxide film, prevent the workpiece on the corrosion rust, improve the wear resistance, it is a kind of surface treatment, not for any impact on the internal organization, it is not heat treatment, quenching and a fundamental difference between the two.Black finish now commonly used method with traditional alkaline heating were black and appear relatively late at room temperature were black two kinds.But black process for low carbon steel at room temperature effect is not very good.Alkaline black subdivision, and the difference between a black and two black.The main components of the hair black liquor is sodium hydroxide and sodium nitrite.Black when the required temperature tolerance larger, probably between 135 and 155 ℃ can get a good surface, just needed some length of time.