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Green corrosion inhibitors. A review DOI:10.15199/28.2019.1.4

  1. INTRODUCTION Corrosion is defined as a conversion of refined materials: metal, concrete etc. into more chemically stable forms, such as nitrates, sulfides or oxides. Destruction of materials exposed to environment is closely related to corrosion [1]. According to NACE International global costs of corrosion are estimated to be US$ 2.5 trillion which roughly equals to 3.4% of the GDP (global Gross Domestic Product). Savings equal to about 25% of this astronomical sum could be realized by using available corrosion control practices [2]. One of the main corrosion prevention methods is to use corrosion inhibitors. Many of the inhibitors, including alkyl trimethylammonium chloride and alkyl hydroxyethyl dimethylammonium chloride are, however, very toxic to human health and natural environment [3÷6]. Non-toxic, eco-friendly, and low cost alternative is to use natural, green inhibitors, such as fruits, fruits waste, seeds or leaves extracts, chitosan etc. [7÷13]. Studies show that the use of natural extracts is highly cost-effective and practical technique in the fight against corrosion. Some of the plant extracts were even proven to inhibit microbial induced corrosion [11, 12]. This study aims to exemplify natural surfactants that can be used as corrosion inhibitors. 2. CORROSION AS A GLOBAL PROBLEM The impact of corrosion on the global economy cannot be underestimated. Economic sector analysis reveals that corrosion generates highest costs in services (ranging from 40% of total corrosion costs in Arab Countries to 79% of total corrosion costs in United States) followed by industry (20% in the United States to 55% in Arab Countries), and agriculture (1% in the United States to 17% in India) [2]. Due to abundance of forms and prevalence, corrosion cannot be eliminated completely. However, with proper corrosion management practices, savings amounting to 30% of annual corrosion costs could be made [2, 14]. Considerable, corrosion [...]

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