As we all know, in the die-casting aluminum alloy field aluminum alloy die casting air oxidation problem, alias "long mold", "long mold", "moldy powder", "surface mold". Will not only lead to a lot of waste material to enhance the cost of fees, and also due to delayed supply or customers at the occurrence of mold new products lead to the return of goods and many other problems, so aluminum alloy die casting air oxidation problem can not be ignored.

From the surface is white velvet like everyday things moldy, and wipe away the following to occur under the gray-black small spots. This is also the aluminum extrusion produce air oxidation and produce the condition. Here we analyze the main reason of die-casting aluminum alloy air oxidation:

1, aluminum is active metal, in a certain temperature and humidity environment is very easy to air oxidation, i.e. long mold. Therefore die casting stock, etc. must keep the stock amount of environment in the dry and so on.

2, a lot of business aluminum die casting, machine production process later, do not do cleaning solution, or simple tap water rinse rinse, that way, make die casting aluminum alloy surface layer residual film release agent, cutting oil, saponification liquid and so on many stains, which are corrosive gas caused to accelerate the aluminum alloy die casting long moldy spots.

3, the selection of cleaning agent will also affect the die-casting aluminum alloy mold, now very popular "aluminum acid off" and other acidic cleaning agent, in addition to the hair can be removed, and the aluminum oxidation treatment white outside. "Aluminum acid off" component is mainly acid, positive and aluminum materials to produce chemical changes in the release of vapors, vapors from the surface of the workpiece to form a discharge, thus making the oil stains and product workpiece separation out. Surface look especially good, but in fact the goods have long been eroded off a layer, if after the dip washing is not in place there will be some alkaline substances attached to the die casting, immediately erosion make die casting air oxidation.

In addition there are some people use is acidic cleaning agent, because die-casting aluminum alloy material not only have aluminum element, also have silicon, copper, magnesium and other classic, in which silicon content is more. Silicon element prompts the die casting to alkaline cleaner adsorption is very strong, especially the phosphorus system of alkali modifier, prompted by the subsequent immersion can not be complete, alkali on the aluminum alloy air oxidation corrosion relative to the acid slower.

Now on the market is a better choice or neutralized green cleaning agent, not only clean up completely, easy to soak and wash, aluminum alloy die casting surface corrosion resistance, but also to a large extent to avoid because of acidic and alkaline cleaning agent triggered by aluminum alloy die casting air oxidation problems.