Method for rapidly detecting leadless copper alloy die casting surface defects

Abstract

The invention discloses a method for rapidly detecting leadless copper alloy die casting surface defects, which comprises the following steps: removing wax, removing oil, dissolving the oil-removing powder in water to prepare the 15-25g / L of oil-removing liquid, then immersing the leadless copper alloy die casting in the oil-removing liquid with the temperature of 60-70 DEG C, performing ultrasonic cleaning; washing, pickling, washing the leadless copper alloy die casting by an activated silicate aqueous solution; and determining the conditions of product surface defects according to the color of the leadless copper alloy die casting surface. The detection method is characterized in that the raw material and the concentration can be repeatedly tested, the material defect problems of the leadless copper alloy die casting surface can be presented, the material defects of the die casting surface can be rapidly detected, the accuracy is high, the electroplate yield can be substantially increased, the resource waste is reduced, the cost is saved, the method provided by the invention is suitable for the leadless copper alloy die casting, especially suitable for a leadless copper water faucet, and can be used for large-scale sample detection.

Description

technical field [0001] The invention relates to a rapid detection method for surface defects of lead-free copper alloy die castings. Background technique [0002] Because the ductility of lead-free copper alloy is much worse than that of lead-containing copper, the proportion of cracks on the surface of lead-free copper alloy die-casting parts, loose material and other poor materials is relatively high. Defects such as sand holes, cracks, and loose materials on the surface of the parts are covered by the polishing wax, and it is difficult to detect them before electroplating. Among the surface defects of die castings, the biggest material problems are cracks and loose materials, while sand holes can be covered by electroplating due to small surface defects, so electroplating has little effect on the quality of die castings. [0003] Die-casting parts have wax removal and oil removal processes in the pre-plating process to remove polishing wax, but after the die-casting part...

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Problems solved by technology

[0003] Die-casting parts have wax removal and oil removal processes in the pre-plating process to remove polishing wax, but after the die-casting parts are washed with wax-removing water, there will be a hydrophobic film on the surface, which makes the surface of the die-casting parts dull and dull, increasing the Difficulty in inspection. After dewaxing the die-casting parts, then degrease. The alkaline degreasing water can effectively remove the hydrophobic film on the surface, and at the same time remove the oil stains on the surface and inner cavity of the die-casting parts. The concentration of the alkaline degreasing water is generally 40 ~70 g / L, its high concentration causes the surface of the die-casting parts to turn brown, and it is impossible to correctly distinguish the defective die-casting parts. Therefore, the surface defects of the lead-free copper alloy die-casting parts cannot be detected after the pre-plating treatment. The rate of electroplating yield is low, and the unqualified products of electroplating cause great waste of resources

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