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Introduction to surface protection and decoration (coating and plating) process of iron products: Oct 22, 2018

Introduction to surface protection and decoration (coating and plating) process of iron products:

   The process of making the surface of the wrought iron product can reduce and avoid the corrosion of the metal surface, and the decorative process is called the protection and decoration of the surface of the wrought iron product. For wrought iron products, the method of surface protection and decorative treatment is generally adopted. There are many kinds of specific treatment methods, but in the case of wrought iron products, coating and electroplating (hot plating) are commonly used, and if they are used together, it is the best for durability.

1. Non-metallic protective layer: One or several layers of organic and inorganic compounds, such as paint, plastic, rubber, asphalt, tantalum, acid-resistant materials, anti-rust oil, etc., are applied on the surface of wrought iron products.

2, metal protective layer: on the surface of wrought iron products coated with a layer of metal or alloy that is not easy to rust, such as zinc, tin, nickel, chromium, copper, titanium and so on. Commonly used methods are: electroplating, spraying, hot dip plating, etc., but the metal protective layer used on wrought iron products should generally be hot dip galvanized. Due to the professional degreasing and rusting of the plated workpiece before plating and high temperature immersion plating in Zn at 440 °C, the coating can cover many defects and gaps to avoid rust afterwards (especially suitable for rust prevention of outdoor wrought iron products). ), and has excellent adhesion properties.

3. Chemical protective layer: chemical and electrochemical methods are used to form a protective layer of non-metallic film on the surface of wrought iron products, such as blackening, bluing, and phosphate treatment.

The protective layer obtained by the above several methods has both a protective effect and a certain decorative effect. However, for wrought iron products, the majority of users are increasingly demanding that the surface of wrought iron products not only be rust-proof, but also have a variety of different textures, three-dimensional or distressed, antique and other artistic effects, or a gorgeous appearance. Therefore, on the basis of the above, it is more and more important to select the paint brand with the strongest affinity and the most aging resistance from the thousands of paint varieties currently on the market and the reasonable application method. Only the targeted choices will achieve the desired decorative effect and reduce the amount of maintenance work after several years.