Professional China Spray Nozzles For Pretreatment Applications - Pretreatment and electrocoating process – Surley

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Various materials and their products in the process of processing, transportation, storage, its surface is easy to produce or
stick foreign matter, such as machining burr, oxide skin, oil, etc., these surface contaminants will affect the compactness of the coating and the bonding strength with the matrix. Coating pretreatment of the mainThe objective is to remove these substances and perform the appropriate surface chemical conversion to provide suitableCoating requirements of the substrate, in order to increase the adhesion of the film, prolong the service life of the film, Give full play to the protective effect and decorative effect of coating.

Therefore, spray the content before processing. It mainly includes the following aspects:

Degreasing before coating

Steel and its parts in the process of storage and transportation to use antirust oil protection, sheet metal workpiece in drawing oil should be used when pressure processing, parts should contact emulsion when machining, heat treatment may contact cooling oil, when parts are often have oil stains and HanJi of the operator’s hands, the grease of the parts but also the impurities such as always and dust mixed together All this, all kinds of oil on the parts not only hinder the formation of phosphating film, but also affect the adhesion of the coating drying performance decorative performance and corrosion resistance Table 3-1 lists the different pretreatment of cold rolled steel plate. Effect of cathodic electrophoretic coating on corrosion resistance.

Phosphating

Phosphating is a simple, reliable, low-cost and convenient process to greatly improve the corrosion resistance of metal surface coating. It has been widely used at home and abroad, especially in automobile coating, which is more widely used in recent years. Almost 100% of the thin plate parts in the automobile industry are phosphating Phosphating process refers to the metal surface in contact with the acid solution containing dihydrogen phosphate salt, chemical reaction and generated in the metal surface stability of the insoluble inorganic compound membrane layer of a surface chemical treatment method and the generated film called phosphating film.

Phosphate film principle

phosphating film was able to provide a very appropriate base for paint coating, is due to the following effect :
1) Provides a clean, uniform, grease-free surface on the basis of complete degreasing
2) enhances the adhesion of organic film to the substrate due to physical and chemical action It is not difficult to understand that the porous structure of phosphating film increases the surface area of the substrate, so that the connection area between the two increases correspondingly, and the beneficial mutual permeability between the two film layers is generated. At the same time, the chemical interaction between unsaturated resin and phosphate crystal also enhances its binding force
3) provide a stable non-conductive isolation layer, once the coating damage, it has the role of corrosion inhibition, especially for anode incision The first point is often neglected Only to completely to the best of the oil to form a satisfactory phosphating film So the phosphating film itself is the most intuitive effect of pretreatment technology of the most reliable a self-check.

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Professional China Spray Nozzles For Pretreatment Applications - Pretreatment and electrocoating process – Surley detail pictures

Professional China Spray Nozzles For Pretreatment Applications - Pretreatment and electrocoating process – Surley detail pictures

Professional China Spray Nozzles For Pretreatment Applications - Pretreatment and electrocoating process – Surley detail pictures

Professional China Spray Nozzles For Pretreatment Applications - Pretreatment and electrocoating process – Surley detail pictures

Professional China Spray Nozzles For Pretreatment Applications - Pretreatment and electrocoating process – Surley detail pictures


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We depend on sturdy technical force and continually create sophisticated technologies to meet the demand of Professional China Spray Nozzles For Pretreatment Applications - Pretreatment and electrocoating process – Surley , The product will supply to all over the world, such as: Borussia Dortmund, Georgia, Belgium, Qualified R&D engineer will be there for your consultation service and we will try our best to meet your requirements. So please feel free to contact us for inquiries. You'll be able to send us emails or call us for small business. Also you are able to come to our business by yourself to get further knowing of us. And we will surely give you the best quotation and after-sale service. We're ready to build stable and friendly relations with our merchants. To achieve mutual success, we will make our best efforts to build a solid co-operation and transparent communication work with our companions. Above all, we are here to welcome your inquiries for any of our goods and service.
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    5 Stars By Evelyn from Italy - 2018.09.29 17:23
    Staff is skilled, well-equipped, process is specification, products meet the requirements and delivery is guaranteed, a best partner!
    5 Stars By Alberta from Johannesburg - 2017.08.21 14:13
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