Defects in the cleaning process of large aluminum forgings

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Defects in the cleaning process of large aluminum forgings

1. Excessive corrosion:

There are pits or pits on the surface of large aluminum forgings, which are in the shape of rosin pores. Due to the deterioration of the pickling solution, the pickling time is too long, or there is acid residue on the forging.

2. Corrosion cracks:

It mostly occurs on martensitic stainless steel forgings, which are characterized by fine network cracks on the surface of the forgings, and the cracks extend along the grain boundaries in the microstructure. Since the residual stress on the forgings after forging was not eliminated in time, stress corrosion occurred during the pickling process, resulting in the formation of cracks.

3. Local overheating cracks:

Cracks that appear when the surface is cleaned with a grinding wheel. It is prone to occur on ferritic stainless steel forgings. It is caused by local overheating caused by grinding with a grinding wheel. An air shovel can be used instead to clean up its surface defects.