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过去,人们对锌、铝及其合金涂装前预处理的研究较少,而锌、铝件与漆膜或其它有机膜的结合力又十分差,因此研究其涂装前的预处理十分重要。一、锌的磷化与涂装锌及镀锌钢板在磷化液中都可进行磷化处理,但在含氟化物的磷化液中进行会更好。为了考查磷化对漆结合力及耐磨性的影响。在镀锌钢板上采用两种处理方法形成磷化膜。一是浸渍处理,磷化3～5分钟,形成3～6g/m~2的膜。其工艺过程是:除油(30～50℃,3～5分钟)-酸洗(2%H_2SO_4+1%HF,0.5分钟)-水洗-表面调整(磷酸钛盐,2g/l,30～60秒)-磷化(35℃,3～4分钟)-水洗-干燥。第二种方法是涂刷形成磷化膜。这种方法形成的膜可在3～8g/m~2范围内变动,与所用溶液浓度有
In the past, there was less research on the pretreatment of zinc, aluminum and its alloys before coating, while the adhesion between zinc and aluminum and the paint film or other organic film was very poor, so it is very important to study the pretreatment before coating . First, the phosphating and coating of zinc Zinc and galvanized steel phosphating solution can be phosphating, but fluoride in the phosphating solution will be better. In order to examine the impact of phosphating on the paint adhesion and wear resistance. Two methods of treatment are used to form the phosphate coating on galvanized steel. First immersion treatment, phosphating 3 to 5 minutes to form a 3 ~ 6g / m ~ 2 membrane. The process is as follows: Degreasing (3-5 minutes at 30-50 ° C) - Pickling (2% H 2 SO 4 + 1% HF for 0.5 minutes) - Washing - Surface preparation (titanium phosphate, 2g / Sec) - Phosphating (35 ° C, 3-4 minutes) - washing - drying. The second method is brushing to form a phosphate film. The membrane formed by this method can vary within the range of 3 ~ 8g / m ~ 2, and the concentration of the solution used there