Polished stainless steel casting surface White spots appear related to the case, the company usually cast in the use of stainless steel, anodized film tends to occur after staining. The reason this happens is because the casting loose tissue, high porosity, contains a variety of metallic and non-metallic impurities, so is often difficult to guarantee the quality of the oxide film. Based on past experience, there are the following main ways to avoid this problem from occurring. 1, high voltage and high current density shock method. That was in the early stages on the use of high-pressure casting oxidative shock, so that part has been oxidized by electric shock and then connect into tablets. 2, surface grinding method. This method is to polish off the aluminum mill has been filling the gap left by the partial oxidation enables the generation gap are connected together, the role of a bridge. 3, surface blasting. This method is to use a hammer round gap closed by tapping it, you can achieve the goal even into the film. Specific problems which method to use to avoid actually generated, it depends on the extent of stainless steel castings and related contaminated use tool. Stainless steel casting surface along the direction of strain traces of mold, namely abrasions. It has two characteristics: 1. After the flow-impact metal wall, causing the metal walls of the type of strong welded or adhered (as will be forced to throw in a thick paste of mud wall adhesion phenomenon now, as the greater the force, the more adhesion), And when adhered to the release site at the time, pushed the metal pull and tear the epidermis, casting the site appeared strained. 2. Mold forming surface quality is poor, the stainless steel castings stripping cause injury, mostly straight (release direction) of the channel, shallow less than 0.1 mm, a depth of about 0.3 mm. Severe abrasions, produce sticky mold, stainless steel castings and even tied it. In the most serious abrasions aluminum. Articles from: Wuxi Yong Sheng Metal Products Co. http://www.cnwxyszj.com
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