Additive manufacturing (AM) is an innovative technology that has revolutionised the manufacturing industry. It has opened up new possibilities for producing parts with unprecedented customisation, intricate designs, and advanced functionalities. One of the most notable techniques in AM is Laser Powder Bed Fusion (LPBF), which can manufacture metallic parts with complex geometries and refined microstructures. However, AM produces materials with unique microstructural characteristics and surface finishes, which are significantly different from those produced through conventional manufacturing methods. These variations, such as finer grain structures, porosity, and residual stresses, can significantly affect the material properties. Applying surface plasma nitriding can markedly enhance the wear and corrosion resistance of AM-produced parts, in some cases making them superior to conventionally manufactured equivalents. This presentation will explore the corrosion characteristics and other mechanical and tribological properties of various metallic materials produced through AM, such as stainless steel, maraging steel, tool steel and nickel alloy, compared to their traditionally manufactured counterparts. Additionally, the presentation will examine the effects of various heat treatments on nitride layer formation and present corrosion and wear testing results to underscore the significance of our findings. All the results will be linked to the microstructure itself and microstructure evolution during heat treatments and plasma nitriding in relation to specific AM microstructure features.