Phosphating treatment refers to a chemical treatment approach in which a metal surface is contacted with an acidic service consisting of dihydrogen phosphate, and a chemical reaction occurs to form a steady insoluble inorganic substance movie on the metal surface area. The formed film is called a phosphating movie.
The modern-day phosphating procedure is normally: degreasing → water washing → rust elimination → surface conditioning → phosphating → water washing → drying.
Degreasing: The grease on the parts not only hinders the formation of phosphating film but likewise impacts the adhesion and rust resistance of the coating when it is painted after phosphating.
Passivation treatment is the last procedure step in chemical cleaning, and it is a crucial step. After the boiler is marinaded, cleaned with water, and washed, the metal surface area is very clean, extremely activated, and prone to corrosion. Therefore, passivation treatment needs to be performed immediately to form a protective movie on the cleaned-up metal surface area to slow down deterioration.
Purpose: Comprehensive pickling and passivation treatment of stainless steel to eliminate all types of dirt such as oil, rust, oxide scale, welding spots, etc. After treatment, the surface area ends up being uniform silver-white, which significantly enhances the corrosion resistance of stainless steel. It appropriates numerous types of stainless steel parts, Plate and its devices.
Features: Simple operation, convenient usage, cost-effective and useful. At the same time, high-efficiency rust inhibitors and fog inhibitors are contributed to prevent metal from over-corrosion and hydrogen embrittlement and to inhibit acid fog.
The passivation procedure is normally: degreasing → water cleaning → delighting → water washing → passivation → water cleaning → drying.
Phosphating and passivation are both surface anti-rust effects.
Pickling is the procedure of using dilute hydrochloric acid, sulfuric acid, and phosphoric acid to eliminate rust from rust on the metal surface. It is often used in the shipbuilding industry. For pipeline rust elimination, the inner wall of the pipe is normally rusted when the pipeline is installed. When the rust can not be eliminated manually, Will utilize this technique. In addition, electroplating parts ought to be cleaned up by marinading throughout commercial production. The phosphating process typically occurs more often in automated assembly lines, mainly to increase the bonding force between the metal surface area and the very first coating. For instance, in auto production, the procedure of degreasing → washing → (rust elimination) → surface area conditioning → phosphating → washing → drying-electrophoresis is usually adopted, which usually does not have the function of rust avoidance, however, due to the higher pollution, the use is less.
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