This review provides a brief discussion about how additive manufacturing works, together with its strength and limitations. Fundamental aspects of FDM including the working mechanism, processing parameters have been reported. This study emphasizes on the progress of Polylactic acid (PLA) utilizing FDM and looks at the opportunity it offers as an advance material when integrated with filler compounds forming potential composites. A summary on the recent developments of PLA composites have been included, also elaborating the preparation technique and the relevance of the composite developed. Mechanical properties of pure PLA have been presented highlighting the processing parameter used, types of mechanical tests done and the resulting values from those conducted experiments.

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The efficiency of benzalkonium chloride (BKC) to inhibit the corrosion of carbon steel API 5L in 1 M HCl has been studied by potentiodynamic polarization method and X-ray photoelectron spectroscopy (XPS). Potentiodynamic polarization indicated that BKC is able to retard the corrosion reaction of carbon steel and its corrosion rate decreased with the increasing of BKC concentration up to optimum concentration 7.5 mM. Adsorption and thermodynamic studies indicated that BKC molecules were capable of adsorbing onto carbon steel surface by following Langmuir adsorption isotherm model and their Gibbs free energy obtained at 25, 40, 55 and 70°C were -29.15, -31.67, -37.46 and -35.76 kJ/mol, respectively. Thermodynamically point of view shown that adsorption mechanism of BKC onto carbon steel occurred via both physisorption and chemisorption process. While, adsorption mechanism establish by XPS analysis indicated that BKC was dominantly inhibit the carbon steel via physisorption process. As a conclusion, both potentiodynamic polarization method and XPS suggested that BKC is able to adsorb onto carbon steel and protect the surface from actively react with HCl.