论文部分内容阅读
一、前言一般说来,用于钢铁冷磷化的磷化液,尤其是加入适量氟化物后,都可用来处理铝及其合金。然而,这种方法很少在工业生产上应用,原因是膜的抗腐蚀性能很差。工业上常用的是铬酸盐—磷酸盐膜,以下简称铬—磷膜。铝及其合金的铬—磷膜,是在含有Cr~(6+)、F~-、PO_4~(3-)的酸性溶液中形成的。由于这种溶液对基体金属有较强的腐蚀,因此膜有较高的孔隙率,耐蚀性比铬酸盐膜差,很少单独作为防护和装饰使用。但它具有较高的硬度,与基体金属的附着力较好,所以
I. Introduction In general, the phosphating solution used for the cold phosphating of steel, especially after adding the appropriate amount of fluoride, can be used to treat aluminum and its alloys. However, this method is seldom used in industrial production due to its poor corrosion resistance. Chromate commonly used in industry - phosphate film, hereinafter referred to as chromium - phosphorus film. Chromium-phosphorus films of aluminum and its alloys are formed in an acidic solution containing Cr 6+, F-, PO 4 3-. Because of this solution on the base metal has a strong corrosion, so the film has a higher porosity, corrosion resistance than chromate film poor, rarely alone as a protective and decorative use. But it has a higher hardness, adhesion with the base metal is better, so