Since the alloy push elbow utilizes this always existing film, it neither fades nor does it require frequent maintenance like paint. The color alloy push elbow can also be formed, even in sharp bends, it will not have any adverse effects on the color. The process is closely related to the operating time, and the color will change with time. The order of color change is brown, gold, red, purple and green. A major feature of this process is that its final appearance can reflect the original surface of the material.
The process of carbon steel elbow is to soak the alloy push elbow in a solution tank. The solution should preferably contain 250 grams of Cr2O3 per liter and 490 grams of sulfuric acid per liter. The temperature range is 80~85℃, and the soaking time depends on it. For the required color, no more than 25 minutes. After rinsing the alloy push elbow with clean cold water, it is placed in a liquid with a concentration of 250 g/1 liter of chloric acid and 2.5 g/1 liter of phosphoric acid at room temperature for cathode treatment. The time is about 10 minutes, and the current density It is 0.2~0.4A/dm2.