Influence of Pre-Tinning Process on Coating Morphology and Interface Structure of Low Carbon Steel Dipped in Molten 6061 Al Alloy

Pre-treated low carbon steel specimens with flux or + tin mixture were coated by hot-dip aluminizing process. Al alloy (6061) was melted and hold at 750 °C. Fluxed pre-tinned samples dipped in a molten bath for time intervals of 0.5, 1, 2.5 3.5 min. Applying double coating processes via tinning-aluminizing techniques facilitated the formation Fe-Al intermetallic interface increasing thickness homogenous layer over substrate material. The presence Sn facilitates to great extent better interlayer-free bond residual and/or oxides. fluxed–dipped substrates have inhomogeneous distribution as well an oxides dipping up A good morphology homogeneous thin achieved tinned all applied times. comparison between pre-tinning pre-fluxing on showed significant effect tinning fluxing treatment acting Al-coating using short dipping. For min, hardness is greater than that fluxed ones due void steel.