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彩钢板什么材质好?

返回列表 来源: 发布日期: 2019.09.30

彩钢板什么材质好?

彩钢板基层_天津彩钢板涂料_天物彩板


彩钢板的基材可以是冷轧钢卷或热浸镀锌钢。彩钢板有机涂层虽然具有良好的防腐效果,但有机涂层中仍存在一些细小的孔洞。空气和湿气可能进入涂层,然后使基材生锈。因此,采用无涂层基材制成的彩钢板使用寿命长。短,易刮伤后散开,造成涂层剥落。彩钢板的基材主要是镀锌钢板或镀锌合金钢板。
彩钢板的基材彩色涂料的生产工艺分为基材预处理、化学转化膜(非有机金属涂料)、有机非金属涂料,有些生产线还采用后涂工艺。
一、基材预处理
彩钢板的基材作基材的镀锌钢板,如果在生产后不直接进入彩色涂层工艺,则在运输过程中可能会受到腐蚀(白锈)、灰尘和其他污染。如果这些不能去除,就会影响油漆的质量。彩色涂料的质量和理化性能与前处理密切相关。此外,在镀锌生产后,为了防止生锈和油漆,这些油也应在生产彩色涂料前除去。
目前,碱溶液脱脂是常用的预处理方法。
二化学转化膜
一般有三个步骤:一是磷化,先在金属表面形成大量晶体,然后用磷酸盐溶液在金属表面形成一层磷酸盐膜;二是钝化密封,磷酸盐膜还有一些孔,用铬酸盐反应与孔形成保护膜。
三。用纯水清洗,用脱盐水或去离子水清洗,去除钝化液。
三、有机涂料
有机涂层分为底漆和面漆。底漆要求不高,涂刷平整。但为了安全生产,底漆、面漆一般采用倒涂方式。
后涂工艺:后涂工艺包括印刷、压花、剥离保护膜、层压等,增加了彩钢板的装饰性和保护性。此外,国外一些后涂层工艺还包括冷轧和镀锌生产线中使用的矫直和矫直工艺。


The base material of color steel plate can be cold-rolled coil or hot-dipped plated steel. Although the organic coating of color steel plate has good anticorrosive effect, there are still some small voids in the organic coating. Air and moisture may enter into the coating and then rust the base material. Therefore, the color steel plate made of non-coated base material has a long service life. Short, and easy to spread after scratch, resulting in coating peeling. The base material of color steel plate is mainly galvanized steel plate or galvanized alloy steel plate.

The production process of color coating is divided into pretreatment of substrate, chemical conversion film (non-organic metal coating), organic non-metallic coating, and some production lines also have post-coating process.
I. Pretreatment of Base Material
Galvanized steel sheets as substrates may be corroded (white rust), dust and other contamination during transportation if they do not enter a color coating process directly after production. If these can not be removed, it will affect the quality of the paint. The quality and physical and chemical properties of finished color coatings are closely concerned with pretreatment. In addition, after galvanizing production, in order to prevent rust and paint, these oils should also be removed before the production of color coating.
At present, alkali solution degreasing is the most commonly used pretreatment method.
II. Chemical conversion film
Generally, there are three steps: first, phosphating, first forming a large number of crystals on the metal surface, then forming a layer of phosphate film on the metal surface with phosphate solution; second, passivation and sealing, the phosphate film still has some holes, using chromate to react with the holes to form a protective film.
3. Wash with pure water, wash with desalted or deionized water to remove passivating liquid.
III. Organic Coatings
Organic coatings are divided into primers and topcoats. The requirements of primers are not high and can be painted smoothly. However, for the sake of production safety, primers and topcoats are generally painted in reverse mode.
Post-coating process: The post-coating process includes printing, embossing, peeling protective film, lamination and so on, which increases the decorative and protective properties of color steel plate. In addition, some foreign post-coating processes also include leveling and straightening processes used in cold rolling and galvanizing production lines.
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