Why aluminum die casting mold and the surface will appear spots?
4, aluminum moldy reasons
a, aluminum products save the environment, temperature and humidity for mold growth;
b, the surface of aluminum products, mixed with deliquescent substance, automatically absorb moisture to the air, forming a "galvanic corrosion reaction" to create a suitable environment for the growth of mold;
c, aluminum due to the "galvanic corrosion reaction", a basic compound precipitated on the surface quality, after deliquescence, suitable temperature and humidity, mold growth quickly;
d, the surface of aluminum products, grease, and other plant fibers for mold growth "soil", once a suitable temperature and humidity, mold growth quickly;
3, aluminum mildew:
Mildew is caused by microorganisms, at a certain temperature and humidity (10 ~ 40 ℃, 25 ~ 40 ℃ for the most active temperature, humidity> 65%), aluminum alloy surface microbial growth and reproduction, resulting in partial rendering can be erased gray patches.
2, aluminum corrosion:
Between aluminum and chemical or electrochemical environment interactions lead to changes in alloy composition, performance suffers phenomenon.
Aluminum corrosion is mainly divided into two types:
a, aluminum and acid, alkali solution to produce a chemical reaction, a solution containing aluminum ions are formed;
b, aluminum happen "galvanic corrosion" in the electrolyte solution;
1, aluminum die casting, during storage, not the physical appearance of the original spots, mainly caused by the following two kinds of reasons:
a, cast aluminum corrosion;
b, mildew casting aluminum alloy;
