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Stainless steels are extensively used for both engineering and industrial applications based on their excellent properties which makes them fit for various purposes. During applications, they are usually faced with corrosion attacks which have always been their uttermost challenge. To this reason, this research enumerates the properties of stainless steels, the use of inhibitors for control, existing research on austenitic 316L stainless steel with their inhibitor efficiencies, the environment used, the concentration of the environment used, experimental analysis carried out, and emphasis on the use of organic inhibitor for a sustainable industry. The results of each research showed strong inhibition efficiency values with an optimum efficiency value of 98.86%, which suggests excellent performance of organic inhibitors due to their functional groups and molecular species which promote strong adsorption inhibition mechanism.

Corrosion problem has been a major challenge in the crude distillation overhead system of the petrochemical industry. It affects every part of the metallic structures of the crude distillation overhead system due to contaminants from crude oil. As a result of this, lots of revenue are been incurred to tackle it. This review therefore discussed the definition of a crude distillation overhead system, its working principle, the structural material for constructing crude distillation overhead system, the types of corrosion that occurs in crude distillation overhead system, the economic cost, the prevention and control methods employed in crude distillation overhead system. Also, the review showed that materials used for crude distillation overhead system, such as carbon steels, are mostly affected by pitting corrosion, intergranular corrosion and general corrosion. In addition, the review showed that the use of material selection, inhibitors, protective coating and cathodic protection are the common prevention and control methods usually employed in crude distillation overheard system. However, the review stated that the use of inhibitor is the most trusted and time tested as the proven method of prevention and control in crude distillation overhead system. This will help to reduce the huge economic cost incurred on corrosion effect in petrochemical industry, especially in the crude distillation overhead system.

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Ammonium chloride is a destructive agent of localized corrosion which poses devastating threat to refining structure integrity and the safety of the refinery processes. Ammonium chloride is an underdeposit corrosion commonly found in overhead equipment and piping for crude and hydroprocessing units. This form of insidious form of corrosion had caused severe fouling that posed negative impact on the operating reliability of various processing units. This review addresses the corrosion mechanism of ammonium chloride, affected materials and equipment, Environmental factors for its impact, thermodynamic behavior of a wet ammonium chloride system, some case studies of ammonium chloride and the preventive measures to mitigate its effect.