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The surface of the alloy button is very smooth before it is used for electroplating. After the electroplating, some blisters on the surface of the alloy button are found, which seriously affects the appearance and quality of the button. The master thought many ways to solve this problem. Surface Defects Symptoms: There are protruding vesicles on the surface of the alloy button. The appearance of blisters may have occurred just after the blank has been cast, or it may have occurred after the polishing process, and it may be found after injection or electroplating. The reason we can analyze from the following aspects:
1. Caused by holes: mainly pores and contraction mechanisms, pores are often round, and most of the shrinkage is irregular.
(1) Causes of pore formation: a During the filling and solidification process of molten metal, gas intrusion causes voids on the surface or inside of the casting. b The gas invaded by the coating invades. c The alloy contains too much gas and precipitates when solidified. When the gas in the cavity, the gas that the coating volatilizes, and the gas that is solidified by the alloy, when the mold exhausts poorly, the pores that remain in the casting are eventually formed.
(2) Reasons for the shrinkage cavity: a During the solidification of the molten metal, shrinkage occurs due to the shrinkage of the volume or the lack of liquid metal in the final solidified part. b. Partial overheating of castings or castings with uneven thickness results in slower solidification in one part and recesses in the surface when volume shrinks.
Due to the existence of pores and shrinkage holes, the holes may enter water when the die castings are subjected to surface treatment. When baking is performed after painting and plating, the gas in the pores expands by heat; or the water in the pores may become vapor and expand in volume. As a result, the casting surface blisters.
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