Accelerated Test of Die Casting at High Temperature and High Humidity
Die casting is a precision casting method, the principle is to melt the better metal [zinc, tin, lead, copper, magnesium, aluminum]... Six kinds of alloy melting, with rapid high pressure mechanical properties into the metal mold, the use of steel mold low temperature rapid solidification molding casting method, die casting is a pressure casting parts, can be manufactured into auto parts, locomotive parts, LED lamps and LED street lights, consumer electronics parts, cameras, mobile phones, communications... In order to confirm whether the die-casting parts can be satisfied with the outdoor environment for a long time and whether there will be related defects, relevant tests need to be carried out through the HAST highly accelerated life testing machine.
Common defects in die casting: cold insulation, cracks, holes
List of common specifications for die casting:
ASTM B85: Standard for pressed Film Casting of aluminum alloys
ASTM B86: Zinc and zinc aluminum alloys
ASTM B176: Copper Alloy die castings
ASTM B894: Zinc-Copper-Aluminum Alloy die casting
ASTM E155: Standard Reference Radiographs for the inspection of Aluminum & Magnesium castings
ASTM B94: Magnesium Alloy mold standard
GB5680: high manganese steel casting
GB9438: Aluminum alloy casting
GB15114: Aluminum alloy die casting
QC273: Technical specifications for automotive zinc alloy aluminum alloy copper alloy die casting parts
YL-J021201: die casting of aluminum alloy cover plate for machine cooler
Die casting test items: metallographic test, mechanical ability, bending test, hardness test, impact test, tensile test, high temperature and high humidity, chemical composition, non-damage inspection (X-ray, fluorescence), residual element analysis, surface defects, dimensional tolerance, microstructure, weight tolerance, air tightness test
Die casting Performance test - high temperature and high humidity accelerated test:
PCT condition: 120℃/100%R.H.
HAST condition: 130℃/85%R.H.
Common missing after high temperature and high humidity accelerated test of die casting:
Die casting in the manufacturing process, if the cleaning is not true, resulting in residual release agent, cutting fluid, saponification fluid on the surface... Such corrosive substances, or other pollutants, under certain temperature and humidity conditions, it is easy to accelerate oxidation or mold, die-casting test product surface with a layer of white powder or yellow, black are oxidation phenomenon.
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