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彩涂板表面包括哪几道工序?

发布者:唐山天物彩板有限    发布时间:2019-08-29 08:34
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彩涂板表面包括哪几道工序?

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  为了增强有机涂料对彩涂板基板表面的附着力,提高涂层产品的耐腐蚀能力,彩涂板基板涂层前的表面处理主要包括两个工序,一是前一点提到的脱脂处理;另一个是化学转化膜处理(化成处理),其中脱脂处理通常是由化学清洗、机械磨刷、电解清洗和热水清洗等几个步骤组成。

  A脱脂处理

  (1)化学清洗。彩涂板基板表面沾有的污垢主要是氧化层和油脂,脱除油脂的方法主要是利用油脂能够溶于有机溶剂、能够发生皂化反应等特性,通过用有机溶剂、表面活性剂水溶液和碱溶液进行浸泡和喷洗将金属表面的油污去除,这种方法叫化学清洗。目前最经济的化学清洗剂是碱剂,最有效的清洗工艺是喷洗。因为当用碱洗剂浸泡时,碱剂的质量分数一般在3%-8%,而用喷洗方法清洗时,碱洗剂质量分数约为1%

  (2)磨刷处理。彩涂板基板在前一加工工序即轧制或镀层生产过程中,为了提高其耐腐蚀的能力,往往需要进行钝化和涂油处理,同时在储运过程中,也有可能会黏附了其他脏物或者产生局部的锈蚀。这些钝化处理形成的钝化膜和局部的锈蚀以及黏附的脏物,一般经化学清洗是难以清除干净的,特别是钝化膜,需要在有机涂料涂敷前,通过机械方式即磨刷处理去除,使基板表面活化。

  (3)电解清洗。彩涂板生产线的基板主要以镀锌板或其他镀层材料为主,因此,基板表面清洁处理一般只采用上述(1)、(2)种处理方法。但上一点提到的磨刷处理即机械清洗对去除基板表面的含络钝化膜(铜箔表面防氧化剂)虽然效果不错,但易划伤表面,并可能造成磨料颗粒(如碳化硅、氧化铝)嵌人基体内,同时还可能使挠性基板和薄板基板的尺寸变形。化学清洗去油污性较好,但去除含铬钝化膜的效果差。在正常脱脂段加入电解清洗的优点刚好补充了以上两种方法的不足,不仅能较好地解决机械清洗及化学清洗对基板表面清洁处理中存在的问题,而且还能使基板产生一个微观的比较均匀的粗糙表面,大大提高基板表面的粘合力,这对后面的涂敷工序是十分有利的。

  B表面化成处理

  为增强附着力和抗腐蚀能力,在钢板表面经过脱脂清洗后,还需要进一步进行化成处理即化学成膜处理,使基板表面形成一层化学转化膜,如对钢铁基板进行磷化或铬化处理,对铝基板进行氧化处理等都是提高涂层与基板的结合力。

The final products of color coating production line, no matter what type: coating board, embossing board or laminating (film-pasting) board, must undergo surface purification treatment in the pretreatment stage of unit process section, namely degreasing treatment, chemical conversion film treatment and other two important stages. Among them, the effect of purification treatment has the following points.
 
 
(1) Improve the compatibility and compatibility between the coating and the steel substrate. In addition to degreasing, friction and other cleaning processes, surface treatment can also include chemical conversion treatment of the surface, i.e. coating chemical solution. After chemical conversion, a certain roughness layer can be formed on the surface, which enlarges the surface area of the contact between the coating and the substrate, and is very beneficial to the adhesion of the coating.
 
 
(2) Activate the surface of the substrate. Remove the rust-proof oil, dirt and rust stain coated in the production process of the substrate. The dirt can be divided into two categories: inorganic and organic. The organic dirt is mainly animal oil, vegetable oil and mineral oil. The inorganic dirt is metal oxide, salt, dust and Egyptian sand. In addition, there are organic and inorganic pollutants, such as abrasive debris, abrasive materials and so on. Animal and vegetable oils can be removed by alkali soap. Mineral oil pollution can not be removed by alkali soap. It needs to be removed by trichloroethylene, gasoline, petroleum solvent emulsifier, etc. Inorganic contaminants can be dissolved by acid or alkali, and removed by acid, alkali impregnation, chemical or electrolytic methods and mechanical grinding methods. The removal of inorganic and organic mixed wastes is difficult. In addition to chemical methods, electrolysis and mechanical abrasion should be combined to remove them. Their existence not only affects the appearance of the coating, but also seriously affects the adhesion between the coating and the substrate, which makes the film peel off. Therefore, surface treatment is usually carried out by friction before coating to improve the cleanliness and activation of the substrate surface.
 
 
(3) Enhance the adhesion of the coating to the surface of the object. After removing the rust-proof oil, rust spots and dust attached to the substrate surface, chemical coating can be carried out on the clean substrate surface to form a network chemical conversion film with CrC as the basic framework, so as to increase the adhesion between the substrate and the coating, improve the corrosion resistance of the substrate and the durability of the coating. In order to ensure that the chemical conversion coating with uniform structure and strong adhesion can be formed on the surface of the substrate during the chemical conversion treatment, so as to avoid the bubble phenomenon caused by oil pollution, air, moisture and so on.
 
 
(4) Ensure and improve the protective performance of the coating. In normal service environment, corrosive ions such as oxide scale and rust may penetrate into organic coatings and reach the surface of steel base. Because the electrode potential is about 0.15-0.26V higher than that of iron and steel, it becomes cathode, and steel itself becomes anode, which causes corrosion under film. With the continuous development of corrosion, the organic coatings will eventually appear drum. Bubble until destroyed and peeled. In order to improve the corrosion resistance of the organic coated steel plate, the surface treatment process was completed before the steel plate was coated, which greatly improved the corrosion resistance of the organic coated steel plate and prolonged the service life of the coating.
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