Common methods of metal surface treatment in Dalian

Common methods of metal surface treatment in Dalian

Dalian metal surface treatment mainly comes from the cleaning water of surface blending and anodizing process. Metal ions, phosphates and inorganic salts are low CODCr, which are usually treated by physicochemical treatment. Organic wastewater: it mainly comes from wastewater with high chroma and CODcr such as oil removal and coloring, which contains high organic substances such as oils and dyes. For this kind of wastewater, chemical oxidation and precipitation must be adopted first, and then biochemical methods must be adopted to degrade chroma and CODcr. After treatment, it can be reused for production or discharge.

Concentrated waste liquid: the concentrated waste liquid of surface treatment mainly comes from the tank liquid discarded and replaced in each production process. The main pollutants in the waste liquid are high concentration acid, alkali, heavy metal or organic matter. If discharged into the waste water treatment system, the treatment facilities will not operate normally. It needs to be delivered to the hazardous waste treatment station for outward transportation or recycling. Reasonable application of mold surface treatment technology to obtain high-precision mold surface is a necessary condition for the production of products with high precision and good surface quality. These technologies have many problems, such as uneven distribution of surface hardness, heat treatment deformation and so on.

Dalian metal surface treatment for the future technical transformation direction, everyone's common concern lies in the application of new technologies, such as surface coating technology, TD coating treatment technology, laser surface strengthening technology and electron beam strengthening technology. Another development direction of the improvement of heat treatment technology is to combine the traditional heat treatment process with the advanced surface treatment process to improve the service life of die-casting die. For example, the chemical heat treatment method carbonitriding, NQN combined with conventional quenching and tempering process, namely carbonitriding quenching carbonitriding compound strengthening. Changing the steel wire diameter of the stainless steel brush can obtain lines of different thickness.

Intermittent silk lines are generally processed on a polishing machine or a texturing machine. Preparation principle: two groups of differential wheels rotating in the same direction are adopted. The upper group is a fast rotating grinding roller and the lower group is a slow rotating rubber roller. Aluminum or aluminum alloy plate passes through the two groups of rollers and is brushed with fine intermittent straight lines.

Dalian metal surface treatment ripple is generally made on a polishing machine or a texturing machine. Using the axial movement of the upper set of grinding rollers, grind and brush on the surface of aluminum or aluminum alloy plate to obtain wavy lines. Stick a polyester film with straight edges on the carriage to limit the thread race. The rotation of the felt and the linear movement of the carriage are used to spin and wipe the thread pattern with the same width on the surface of the aluminum plate. Oxidation coloring of aluminum alloy is a common surface treatment process for small electromechanical products. Its function is to enhance the corrosion resistance of the product surface and make the product have decorative effect.