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首页 > 新闻动态 > 粉末静电喷涂的前处理工序
粉末静电喷涂的前处理工序
责任编辑: 人气:4748 发表时间:2019/10/04

粉末静电喷涂的前处理工序


    粉末静电喷涂的前处理工序大致可以分为:脱脂→水洗→除锈→水洗→表调→磷化→水洗→去离子水洗→烘干。  

    脱脂主要是利用含有表面活性剂的碱性物质对工件表面进行除油和去污,但有的小型加工厂可能会选择有机溶剂除油,这种脱脂方式虽然简便,但有机溶剂对环境及操作者的危害非常大。

    脱脂干净后,需要对工件表面进行彻底水洗,防止工件从前道工序带过来的残留槽液及杂质对磷化膜完整性的影响。

    除锈工序大多选用稀硫酸或稀磷酸的酸性液对工件进行浸泡处理,对于表面锈蚀严重的工件,需要采用喷砂或抛丸等机械方法处理,但机械除锈后仍需对工件进行酸液处理,直至锈迹处理彻底后才能进入下道工序。

    除锈后的水洗主要是防止工件残留酸性液过多而破坏表调液的酸碱平衡,同时也为表面调整工序提供更加新鲜光洁的基体表面。

    表面调整工序主要是改变工件表面微观状态、细化磷化结晶、缩短磷化时间,同时也能消除钢铁表面状态的差异对磷化膜质量的影响,可以说表调工序质量的好坏,将直接影响磷化膜的最终质量。

    磷化是大幅度提高金属表面涂层耐腐蚀性的一种简单可靠、费用低廉、操作方便的工艺方法。按磷化液的磷酸盐分类,有磷酸锌系、磷酸锰系、磷酸铁系,此外,磷酸锌盐中还有加钙的钙系,加锰、镍的“三元磷化”体系等。

    磷化成膜完整后,需要及时对工件进行彻底的水洗,一般水洗两次,建议最后一道水洗采用新鲜纯水洗,以免残留的酸性液对涂料成膜过程中的不良影响。

    水洗干净后,需要对工件进行切水干燥,一般烘干条件为150oC/10-30分钟左右。注意烘干温度不宜过高,以免静电粉末喷涂磷化膜出现发白及粉化等缺陷。

Pre-treatment process of powder electrostatic spraying
The pre-treatment process of powder electrostatic spraying can be roughly divided into: degreasing → washing → rust → washing → tone → phosphating → washing → Deion washing → drying.
Delipidation is mainly the use of alkaline substances containing surfactants to remove oil and decontaminate the surface of the workpiece, but some small processing plants may choose organic solvent to remove oil. Although this degreasing method is simple, organic solvents are harmful to the environment and operators. very large.
After the degreasing is clean, the surface of the workpiece needs to be thoroughly washed to prevent the influence of residual groove fluid and impurities brought by the workpiece from the previous process on the integrity of the phosphating film.
Most of the rust removal processes use dilute sulfuric acid or dilute phosphoric acid to soak the workpiece. For workpieces with severe surface Rust, mechanical methods such as sand blasting or pellets need to be used. However, after mechanical rust removal, the workpiece still needs to be acid-liquid treatment., Until the rust treatment is complete before entering the next process.
The water washing after rust removal is mainly to prevent the workpiece from excessive acid residue and destroy the pH balance of the table adjustment solution. At the same time, it also provides a fresher and cleaner matrix surface for the surface adjustment process.
The surface adjustment process is mainly to change the surface microscopic state of the workpiece, refine the phosphating crystallization, shorten the phosphating time, and also eliminate the influence of the difference in the surface state of steel on the quality of the phosphating film. It can be said that the quality of the surface adjustment process will directly affect the final quality of the phosphating film.
Phosphorization is a simple, reliable, inexpensive and convenient process method for greatly improving corrosion resistance of metal surface coatings. According to the phosphate classification of phosphating liquid, there are zinc phosphate system, manganese phosphate system, iron phosphate system. In addition, zinc phosphate salt also has calcium calcium system, adding manganese, nickel "three-way phosphating" system.
After phosphating the film, it is necessary to wash the workpiece thoroughly in time. Generally, it is washed twice. It is recommended that the last wash be washed with fresh and pure water to avoid the adverse effects of residual acid solution on the coating process.
After the water is washed, the workpiece needs to be cut and dried. The general drying condition is about 150oC/10 -30 minutes. Note that the drying temperature should not be too high, in order to avoid electrostatic powder spraying phosphating film white and powdery defects.



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