Study of aluminum composition in slurry coating solution Available to Purchase

Corrosion or oxidation attacks on carbon steel pipelines can be prevented by producing aluminum slurry coating. Observations of the optimal slurry composition containing aluminum scrap powder as a load agent in the binder solution with a certain mass ratio were studied to obtain good quality aluminum coating on ST37 carbon steel. Several variation compositions of Al content and binder ratio were evaluated by viscosity test and optical microscope (OM), then showed a slurry coating of 43 wt.% Al content and binder ratio of 1:40 possessed good consistency, stable shear-thinning behavior, and the lowest surface roughness. Therefore, further analysis of microstructure was performed on this sample. A surface morphological structure showed moderate roughness with some particle characteristics observed on the slurry coating sample. A cross-sectional structure showed the presence of an internal oxide layer with a thickness of about 129 µm. In addition, a protective oxide Al₂O₃ layer with a thickness of about 173 µm was observed on the top of the internal oxide layer. Phase identification by XRD analysis showed the formation of Fe₃O₄ as the internal oxide layer and α-Al₂O₃ as the protective oxide layer with a small amount of unstable Al₂O₃, α-Fe, and Fe₃Si phases.