Additive manufacturing (AM), often termed 3D printing, has recently emerged as a mainstream means of producing metallic components from a variety of metallic alloys. The numerous benefits of AM include net shape manufacturing, efficient use of material, suitability to low volume production runs, and the ability to explore alloy compositions not previously accessible to conventional casting. The process of AM, which is nominally performed using laser (or electron) based local melting, has a definitive role in the resultant alloy microstructure. Herein, the corrosion of alloys prepared by AM using laser and electronbased methods, relating the corrosion performance to the microstructural features influenced by AM processing, are reviewed. Such features include unique porosity, grain structures, dislocation networks, residual stress, solute segregation, and surface roughness. Correlations between reported results and deficiencies in present understanding are highlighted.

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Layered double hydroxide (LDH) are widely studied as corrosion inhibition coatings for magnesium (Mg) alloys due to their nano-lamellar structure and anion-exchange ability. The two common approaches in synthesising LDH films on Mg alloys are co-precipitation and hydrothermal treatment. Recently, electrodeposition has drawn more interest as a potential synthesis approach due to the low cost, ease of control, one-step method, and ability to create a compact film. In this work, Mg-Fe LDH film was synthesised on magnesium hydroxide, Mg(OH)2 layer formed on Mg alloy WE43 by electrodeposition approach with the as-prepared iron solution at different pH values. The effect of pH of the solution (3.0, 5.0 and 7.0) on the formation of LDH films was investigated using Field Emission Scanning Electron Microscopy (FESEM). Additionally, the surface chemical components of the film were obtained by Fourier Transform Infrared Spectrometer (FTIR). All the LDH composite films synthesised at different pH values undergo electrochemical tests in Hank’s Balanced salt solution (HBSS). All samples promote corrosion resistance of WE43 with the LDH film synthesised at pH 3.0 provided the highest inhibition efficiency (I.E) of 94.48 % and resistance polarisation value of 3559. 07 Ωcm2.