Effects of molten aluminum on H13 dies and coatings
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The effects of molten aluminum casting alloy A390 on a commercially heat treated H13 die steel and two wear-resistant coatings, Cr23C6 and TiN, were investigated by an accelerated corrosion test. The H13 steel suffered severe corrosion due to the rapid formation of intermetallic compounds. The formation of multilayer intermetallic compounds and the simultaneous dissociation of the intermetallic compound τ6 (Al4FeSi) were attributed to the fast dissolution of H13 steels into the melt. This dissolution of the H13 steel was accelerated dramatically by turbulence and an increase in melt temperature. Significant improvement in corrosion resistance was achieved for the H13 steel coated by Cr23C6 via a pack cementation process.
Keywordsaccelerated corrosion test aluminum casting alloy A390 corrosion Cr23C6 die casting dissolution H13 die steel intermetallic compound melt temperature melt turbulence molten aluminum TiN wear resistant coating
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