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鋼件的氧化通称为“发兰”。氧化的方法很多,常用的有碱性氧化与硝酸盐高温氧化等;但无論用那种方法,所获得的氧化膜厚度都很小,硬度低,对于磨损的抵抗力薄弱,防蝕能力也不强。加以氧化溶液缺乏科学的控制办法,一般都是凭經驗掌握,因而廢品率高,药品的消耗量也很大。由于磷化处理方法的試驗成功,因而很大一部份氧化处理的鋼件就被磷化所代替。磷化处理有很多优点、如操作条件安全,磷化膜的防蝕能力比氧化膜强,所消耗的药品少等等,故磷化处理已广泛被机械制造厂所采用。但磷化处理也存在一定的缺点,如:1.仍需加热至90℃
Oxidation of steel known as the “hair blue.” Oxidation of many ways, commonly used alkaline oxidation and nitrate high temperature oxidation; but no matter in that way, the obtained oxide film thickness is small, low hardness, weak resistance to wear, anti-corrosion ability is not Strong. There is a lack of scientific control measures to oxidize the solution, which is generally based on experience, so the rejection rate is high, and the consumption of medicines is also great. Due to the success of the phosphating process, a significant portion of the oxidized steel was replaced by phosphating. Phosphating has many advantages, such as safe operating conditions, anti-corrosion ability of the phosphate film than the oxide film is strong, the consumption of less drugs, etc., so phosphating has been widely used machinery factory. However, phosphating also has some disadvantages, such as: 1. Still need to heat to 90 ℃