Currently, the technology for 16Mn seamless square tubes is mature, with corresponding product standards and various application technologies, and its application fields are extensive. Due to weather and environmental influences, the surface of 16Mn seamless square tubes may rust after continuous use. I will discuss how to remove rust spots from 16Mn seamless square tubes and analyze it for you below.
To achieve the ideal rust removal effect for 16Mn seamless square tubes, the abrasive should be determined based on the hardness of the alloy tube, the initial degree of corrosion, the required surface roughness, and the type of coating, such as single-layer epoxy, two or three layers of polyethylene coating. To reach the ideal rust removal, a mixed abrasive of steel grit and steel shot is required. Since steel shot can reinforce the steel surface, steel grit can corrode the steel surface.
2. Rust Removal Grade: Compared to the construction techniques commonly used for anti-corrosion coatings like epoxy, ethylene, and phenolic on the 16Mn seamless square pipes, the basic requirement is to achieve a near-white surface on the alloy pipe. Practical evidence shows that this rust removal grade can almost remove all oxide scales and rust, ensuring complete satisfaction for the adhesion requirements of the anti-corrosion layer and alloy pipes. Spray rust removal technology can reliably achieve a near-white surface level at a low cost.
3. Prior to the painting process, the 16Mn seamless square pipes have had the grease and oxide scale removed from the alloy tube surface. They are also preheated in a furnace to 40-60°C to maintain the dryness of the alloy tube surface. Since the surface is free of grease and other contaminants, this enhances the rust removal effect. Additionally, a dry alloy tube surface is beneficial for separating steel shot, steel sand, rust, and oxide scale, which will make the alloy tube surface rust-free after treatment.
4. To achieve better uniformity and cleanliness in the surface roughness distribution of 16Mn seamless square tubes, the research and invention of abrasive particle size and ratio are particularly important. This is because excessive roughness can lead to the thinning of the anti-corrosion coating at the anchor line peak, and due to the deep anchor line, bubbles are easily formed during the anti-corrosion process, severely affecting the performance of the anti-corrosion coating.
The essence of时效 strengthening treatment is to precipitate many extremely fine precipitate particles from the supersaturated solid solution, forming a small region enriched with solute atoms. To ensure that not too much solute dissolves into the solid solution during the heating of 16Mn seamless square tubes, and then the solubility decreases during rapid cooling, causing an excess of solute to form a supersaturated solid solution, quenching must be conducted before the aging treatment. During the heat treatment process of 16Mn seamless square tubes, strict control of the heating temperature during aging treatment should be maintained to dissolve the solute into the solid solution to the greatest extent without melting the alloy.
