Water marks and flow lines form on the workpiece surface, compromising aesthetic quality.
Die casting relies on high temperature, high pressure, and high-speed filling. If the sprayed release agent is not fully dried, residual moisture evaporates into gas during injection—this gas becomes entrained in the molten metal, creating internal porosities. A common misconception attributes this to the release agent’s gas evolution(发气量), but the root cause is incomplete drying of the spray, not the agent itself.
Metals—especially A380 alloy—are prone to oxidation. Inadequate drying allows moisture to react with the metal, triggering galvanic corrosion that produces black spots and mold (fungal) growth. These defects make subsequent cleaning and passivation processes extremely challenging.
If moisture remains in the spray, the release agent fails to form a dense protective film on the mold surface. Without this film, the agent cannot effectively prevent adhesion—greatly increasing the risk of mold sticking during demolding.
Sprays with atomization efficiency below 10% are particularly problematic: the undried release agent drains downward along the mold surface due to gravity. When combined with groundwater (which contains high levels of calcium/magnesium ions), these areas accumulate excess release agent and mineral deposits—creating ideal conditions for carbon buildup (a hard, sticky residue that degrades mold performance).
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