Anodizing is not possible on the surface of castings

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Anodizing is not possible on the surface of castings

Posted By George Alice     November 11, 2021    

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First and foremost, I'd like to discuss my actual work experience. In my first job, I was in charge of the development and manufacturing of mechanical and chemical surface treatment products. At that time, we were mass-producing castings, which can also have an anodized surface treatment applied. The majority of the time, die castings will not be anodized because the die-casting compact material exhibits significant differences in aluminum extrusion, forging, and stamping, and because the silicon content of the material is relatively high. After anodizing, there will be a significant amount of floating ash on the surface, which will have an adverse effect on the anode surface quality, particularly in the case of die-casting aluminum adc10 and ADC12 of aluminum silicon copper alloy, which are Japanese brands. ADC12 is equivalent to the alloy code yl113 manufactured in China, and the alloy brand is yzalsi11cu3, Executive standard GB / T 15115-2009. ADC12 is also equivalent to the alloy code yl113 manufactured die casting services in China. Aluminum alloy die castings manufactured in the United States are designated by the brand 384. The executive standard is ASTM B 85-03 Standard Specification for Aluminum Alloy Die Castings.

At that time, the anodizing process for ADC12 die castings was being researched and developed further. HF hydrofluoric acid was used to remove silicon during the pretreatment process. We're on the verge of finishing the anodizing treatment. The black is matte, dark, and slightly yellow in color, which makes it extremely uncomfortable to wear. Furthermore, because the anode layer of this die casting has poor wear resistance and corrosion resistance, anodizing is not recommended for this application.

 


It is important to note that because die cast aluminum adc6 is made from an aluminum magnesium alloy, it will be much easier to anodize, and the appearance effect of surface treatment will be much better than that of ADC12 because its silicon content is typically less than 1.0%. Hard anodizing treatment is used to improve the reliability and quality of the anode layer, including its wear resistance, corrosion resistance, and weather resistance, among other characteristics. In anodic pretreatment, hydrofluoric acid is used to remove ash from the water. In the anodic oxidation tank, a monoacid sulfuric acid agent is employed. The parameters have been set to a low temperature and a high pressure, and the film thickness has been set to a high film thickness of 100um or greater. The liquid in the anodic oxidation tank must be subjected to frequent dosing maintenance and bath reconstruction to ensure proper operation.

When conducting surface treatment on various aluminum materials, I believe that many manufacturers should discover that cnc machining is not suitable for anodizing. This is determined by the composition of die-cast aluminum as well as the characteristics of the anodizing process, among other factors. And if that's the case, why is die-cast aluminum not suitable for anodizing?

Because the anodized film must be uniform and flat, anodizing necessitates that the aluminum surface be free of impurities and that the aluminum material be relatively pure in order for it to be successful. The presence of excessive amounts of impurities and other components will invariably have an effect on the thickness of the film formed during anodic oxidation, and may even have a direct effect on whether or not the film forms at all. Most importantly, other metal elements may directly alter the color of the anodized film when it is formed, resulting in the immediate imposition of the death penalty for dyeing after anodizing.

Aluminum alloys cast in molds and die castings have a high silicon content in most cases. However, even with the use of ht412 special ash remover for die casting aluminum, the anodic oxide film may be dark, and it is difficult to obtain a colorless and transparent oxide film after die casting. The color of the anodic oxide film changes from light gray to dark gray to black gray as the amount of silicon in the film rises in concentration. As a result, cast aluminum alloy is not suitable for anodizing in the traditional manner.

Anodizing solutions are available for die cast aluminum, however. Die casting parts can complete the structure, edges and corners, and oxidation quality that forging parts and turning parts / CNC parts are unable to achieve. Die casting parts are also less expensive than forging parts and turning parts. It is critical to place a strong emphasis on the quality of die casting. The quality of anode is determined by the process's ability to control minor adjustments and minor details.

 


a machine for heating custom die casting casting dies

An innovative type of temperature control equipment in the field of environmental protection, the aluminum alloy die casting services casting die temperature machine is a new type of temperature control equipment. The die casting die temperature machine is primarily intended for use in the die casting industry in general. In order to maintain the mold temperature machine, it is made up of a high temperature resistant heat transfer oil (water) circulating pump, a heater, a control system, pipelines, and a frame. The special mold temperature machine with cooling demand must also be equipped with a cooling system in order to be used properly.

Machine for heating or cooling aluminum alloy die casting die temperatures_ The function of the aluminum alloy die casting die temperature machine is to heat or cool the China die casting manufacturer and maintain its working temperature, as well as to ensure the stability of die casting quality and to optimize processing time. In the die casting industry, die temperature has a significant impact on the quality and timeliness of die castings. When die-casting parts, the use of a die-warming machine can help to improve the overall quality of the finished product.

Die temperature is a critical factor in determining the quality of die castings produced in the die casting process. It is necessary to preheat the die casting mold prior to die casting with a die-casting die warmer in order to achieve the best results. For different die-casting alloy materials, the surface temperature of their dies must be maintained at different temperatures. For example, the temperature range for zinc alloys is generally 170-220 degrees Celsius; the temperature range for aluminum alloys is 220 260 degrees Celsius.

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