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以往显象管上耳环防腐蚀、锈蚀是单镀镍层,但单镀镍层与耳环铁基材料接合不牢,故现改用双镀层,即在铁基材料上先镀上一层铜,以增加与基体的结合力,外再复镀镍。镀铜、镀镍的厚度大小直接影响耳环抗腐蚀、锈蚀性能。现对耳环双镀层厚度的测定采用金相显微组织法。由于三氯化铁盐酸水溶液。(三氯化铁5g、盐酸50ml、水100ml)对纯镍不起作用,却能良好显示奥氏体晶界和铁素体晶界,因此它能显示出铜中r,铁基材料中的α。用三氯化铁盐酸水溶液腐蚀后的耳环双镀层金相
In the past on the tube anti-corrosion earrings, corrosion is a single nickel layer, but the single nickel layer and earrings iron-based material bonding is not strong, so now use double plating, that is, iron-based material first plated with a layer of copper, In order to increase the binding force with the substrate, the outer nickel plating. Copper, nickel-plated thickness directly affect the size of the earrings corrosion, corrosion performance. Now the determination of the thickness of the double-coated earrings metallographic microstructure. Due to ferric chloride hydrochloride acid solution. (Ferric chloride 5g, hydrochloric acid 50ml, water 100ml) on pure nickel does not work, but can well show the austenite grain boundaries and ferrite grain boundaries, it can show copper r, iron-based materials α. Corrosion with ferric chloride solution of hydrochloric acid after double-coated gold earrings