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Pretreatment method of aluminum coil before molding

  • Author:Dong Xing
  • Release on:2017-11-06
Before the coil is rolled, some pretreatment sections are needed to ensure the cleanliness of the aluminum coil surface. Harbin Dong Xing Aluminum Co., Ltd is a competent and reliable Aluminum cladding coil manufacturer china.

In order to avoid the presence of residual grease and lubricants on the surface, the impact on painting and use. Therefore, the aluminum coil should be pretreated in the following aspects before molding.

1. The aluminum coil can be cleaned by hot water. Hot water cleaning is to clean the residual degreasing agent on the substrate surface to ensure that these residues can be dissolved, so as to prevent these degreasing agents from causing two pollution to the substrate. Use for immersion and spray brushing method. The best water quality should not be too high, otherwise, minerals in water will produce mineral spots on the surface of the substrate.

2, hot alkaline degreasing due to pre coated wire speed faster, so the degreasing agent general high concentration degreasing agent typically contains sodium hydroxide (NaOH), sodium carbonate (Na2Co3) and water glass (Na2SiO3) and phosphate group. 

Hot alkali degreasing process is generally divided into two steps to ensure the cleaning of the aluminum coil substrate surface, and the use of spray scrubbing method. Harbin Dong Xing Aluminum Co., Ltd could provide you with 3003 aluminum coil on sale.

3. Passivating it. Passivation treatment is to form a conversion film on the surface of the substrate by pressure spray, dip coating or roller coating. In general, the use of pressurized spray method, the use of passivation liquid in the process of sludge will often plug the spray hole, thereby affecting the effect of spray. Although the method of dip coating solves this problem, the consumption of passivation solution is relatively large.

Some of them need to flush the passivation of excess fluid in the actual operation, will produce waste water purification and recovery, roll coating is the best way of passive construction, has the advantages of uniform coating, economical and practical, do not need washing etc..

If you want to get more information about Harbin Dong Xing Aluminum Co., Ltd, please click Aluminum coating coil 1100.