Graphite shedding and high carbon content will cause black rust spots, as well as uneven surface of the assembly platform, with pores, and blackening caused by spitting acid.

To prevent the appearance of black rust spots on the assembly platform, rust can be removed by first plating copper and filling the pores. Because the dispersibility of copper is better, other plating species can be plated after filling. However, the cost of this method is relatively high. Generally, anti-rust oil is used, but the anti-rust effect is not good, and there are still spot-like rust spots on the surface.

The method of controlling the formation of pores is to select sand with good air permeability, reduce the moisture content of the sand, reduce the fine powder content of the sand, reduce the hardness of the mold, strengthen the air permeability of the mold, rationally design the pouring riser, and reasonably control the resin. Dosage, pay attention to the quality of the resin, reduce the casting speed, and lower the casting temperature without affecting the quality of the assembly platform.

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