Common methods for surface treatment of metals in Dalian

Common methods for surface treatment of metals in Dalian

The surface treatment of Dalian metal mainly comes from the cleaning water of surface and anodic oxidation processes. Containing metal ions, phosphates, and inorganic salts are low CODcr compounds, usually treated with physicochemical methods. Organic wastewater: It mainly comes from wastewater with high chromaticity and CODcr, such as oil removal and coloring. It contains high organic substances such as oils and dyes. For this type of wastewater, chemical oxidation precipitation must be used first, and then biochemical methods must be used to achieve the degradation of chromaticity and CODcr. After treatment, it can be reused for production or discharge.

Concentrated waste liquid: Surface treatment concentrated waste liquid mainly comes from discarded and replaced tank liquids in various production processes. The main pollutants in the waste liquid are high concentrations of acids, alkalis, heavy metals, or organic substances. If discharged into the wastewater treatment system, it will cause the treatment facilities to malfunction. It needs to be handed over to a hazardous waste treatment station for outward transportation or recycling. Reasonable application of mold surface treatment technology to obtain high-precision mold surfaces is a necessary condition for producing products with high precision and good surface quality. These technologies have various problems, such as uneven surface hardness distribution, heat treatment deformation, etc.

The common focus of Dalian Metal Surface Treatment for future technological transformation is 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 for improving heat treatment technology is to combine traditional heat treatment processes with advanced surface treatment processes to improve the service life of die-casting molds. If the chemical heat treatment method of carbonitriding is combined with conventional quenching and tempering processes to form NQN, that is, carbonitriding quenching carbonitriding composite strengthening. Changing the diameter of the steel wire of the stainless steel brush can obtain different thicknesses of patterns.

Intermittent silk patterns are generally processed on a brushing or wiping machine. Production principle: Two sets of differential wheels rotating in the same direction are used. The upper group is a fast rotating grinding roller, and the lower group is a slow rotating rubber roller. Aluminum or aluminum alloy plates pass through the two sets of rollers and are brushed with delicate intermittent straight lines.

Dalian metal surface treatment ripples are generally made on a brushing or wiping machine. By utilizing the axial motion of the upper group of grinding rollers, a wavy pattern is obtained by grinding and brushing on the surface of aluminum or aluminum alloy plates. Stick a polyester film with a straight edge on the mop to limit thread competition. By utilizing the rotation of the felt and the linear movement of the drag plate, a thread pattern with a consistent width is formed on the surface of the aluminum plate. The oxidation coloring of aluminum alloy is a commonly used surface treatment process for small electromechanical products, which mainly enhances the corrosion resistance of the product surface and gives the product a decorative effect.