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.
1. 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.
Chemical treatment is to use a special formula of acidic solution to dip and dissolve iron art products, and remove chemical scales, rust marks and oil stains by chemical reaction, so-called "pickling".
2, degreasing for iron products, generally can use organic solutions, lye, electrochemical and other methods, currently available in the market for a variety of metal cleaning agents are also more suitable.
2. Introduction to the surface protection and decoration (coating and plating) process of wrought 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.
Here you can find the related products in Flange Nuts, we are professional manufacturer of Large Flange Nuts, Hexagon Flange Nuts, Special Flange Nut, Nylon Lock Flange Nuts. We focused on international export product development, production and sales. We have improved quality control processes of Flange Nuts to ensure each export qualified product.
If you want to know more about the products in Flange Nuts, please click the product details to view parameters, models, pictures, prices and other information about Large Flange Nuts, Hexagon Flange Nuts, Special Flange Nut, Nylon Lock Flange Nuts.
Whatever you are a group or individual, we will do our best to provide you with accurate and comprehensive message about Flange Nuts!
Nuts Screws,Hexagon K Nuts,Open End Rivet Nut,Carbon Steel Flat Head Rivet Nut
Suzhou Gubao Screws Co.,Ltd. , https://www.hongyiscrew.com