Today we will introduce some measures of auto spraying line,including Composition of topcoat,Rust removal,Surface adjustment,Phosphating,Wash.
Composition of topcoat
The Auto Spraying Line topcoat consists of two layers: a color paint layer and a varnish layer. The main function of the color paint layer is to decorate and make the car parts look good; it has the outermost layer of the spraying line, and its main functions are: UV protection, waterproof penetration, and resistance Cannibalism, color preservation, acid rain resistance, scratch resistance, etc.
Rust removal
The more effective way to remove rust is pickling. For the modern automobile manufacturing industry, due to the general use of the pull-type production method, the welded parts in white does not need to stay in the middle to enter the spraying line, corrosion is usually too late to occur, so in modern automobile manufacturing companies, the parts painting process The rust removal process has been rarely seen in China. Of course, if the parts stampings and the welded parts have been stored and transferred for a long time, the surface corrosion of the parts may be inevitable. In this case, the rust removal process should be added.
Surface adjustment
Surface adjustment is an important process of spraying line that must be carried out before phosphating. Its function is to change the microscopic state of the metal surface and promote phosphating to form a fine and dense phosphating film. Especially the metal surface cleaned by acid washing or high temperature strong alkali.
Surface adjustment, in short: to prepare for phosphating.
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Phosphating
Phosphating process is a process of chemical and electrochemical reaction to form phosphate chemical conversion film. The formed phosphate conversion film is called phosphating film. The main purpose of phosphating is to provide protection to the base metal and prevent the metal from being corroded to a certain extent; it is used for primer before spraying line to improve the adhesion and anti-corrosion ability of the paint film layer.
Auto parts Phosphating Process
Today's automobile phosphating treatment methods of spraying line include: spraying, dipping, spraying and dipping, brushing, etc. Due to the high production efficiency and high phosphating treatment quality, the dipping treatment method is the most widely used.
Auto Spraying Line Wash
The purpose of water washing is to remove the phosphating solution remaining on the parts surface. The washing effect is related to the washing frequency, washing method, water cleanliness, water quality (tap water, pure water, deionized water), drain time and other process parameters. Multiple washings are the key factors to improve the cleaning effect of spraying line.