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Pretreatment of the surface of wrought iron products. Oct 22, 2018

The surface treatment of wrought iron products generally refers to the process of coating the surface of wrought iron products with anti-rust and effect (appearance) decorative coatings in order to prevent rust on the surface of wrought iron products, eliminating and masking surface defects that do not affect the strength of wrought iron products. Implementation process. In order to ensure the anti-wear and anti-corrosion effects as long as possible, it is inevitable to adopt a number of corresponding surface pretreatment processes and post-coating methods, as well as the choice of materials and application processes.

 Pretreatment of the surface of wrought iron products:

In order to ensure a good adhesion between the decorative coating (plating) layer and the surface of the wrought iron product, it is necessary to carry out the oxidation scale, welding slag, rust marks, grease, dirt and moisture on the surface of the wrought iron product before the coating (plating) is carried out. Possible removal, otherwise it may cause foaming, cracking, delamination and peeling of the coating (plating) layer. The so-called pre-treatment refers to the use of mechanical or chemical, electrochemical and other processes to eliminate surface defects before coating (plating) of wrought iron products.


1. The main methods for removing rust and removing scale slag include manual treatment, mechanical treatment, spray treatment, chemical treatment (acid washing), electrochemical treatment and flame treatment.


Manual processing mainly uses abrasive cloth, scraper, hammer chisel, wire brush, waste grinding wheel and other tools, by hand grinding and shovel, sweeping to remove rust, scale and welding slag, dust and other surface dirt.


Mechanical treatment of the most commonly used wind (electric) brush, derusting gun, polishing wheel and wind (electric) shovel and other tools, with the help of high-frequency impact of mechanical force and friction to remove rust and remove oxides and other paints and other dirt .


The blasting process uses mechanical centrifugation, compressed air, high-pressure water flow, etc. as power to project abrasives, sandstones, and steel shots onto the surface of wrought iron products, impacting and rubbing off scales, rust marks, old paints, molding sands, and the like.