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*Chitin and Chitosan - Physicochemical Properties and Industrial Applications*

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**228**

**231**

**Chapter 11**

**Abstract**

on this subject.

**1. Introduction**

Corrosion

*and Rachid Oukhrib*

The Application of Chitosan-Based

Compounds against Metallic

*Brahim El Ibrahimi, Lei Guo, Jéssica Verger Nardeli* 

Biopolymers-based compounds were used by different manners for metal protection toward corrosion phenomena, namely via inhibiting additive and coating strategies. In the last decade, the application of these compounds or their chemically modified forms as effective replacements for toxic inorganic and organic inhibitors attracts more attention. Additionally to their intrinsic chemical stability, biodegradability, eco-friendly, low cost and renewability, biopolymers set were shown the remarkable effect to control the dissolution of several metallic materials in various corrosive environments. Among a large variety of available biopolymers, chitosan and its functionalized form, as well as its nanoparticle composites, have been reported and widely used as good anti-corrosion compounds for different metal/medium systems. In this context, the current chapter aims to shed more light

**Keywords:** corrosion, chitosan, chitin, inhibitor, metal, solution, coating, composite

Metal corrosion is defined as a spontaneous deterioration of metallic materials caused by the adjacent environments (e.g. during the acidic cleaning process) through electrochemical and/or chemical processes. Such a phenomenon is inevitable due to its undesirable outcomes on technological and industrial applications, which leads to huge loss of natural resources, human lives and economic [1]. In this regard, researchers were compelled to perform several scientific investigations to extend the working life of these materials and to overcome the devastating impact of corrosion. Among available technical solutions, the addition of corrosion inhibitors into the aggressive environment seems to be an attractive and economic technic to effectively control corrosion [2]. Diverse organic and inorganic substances have been employed as anti-corrosion compounds for many metal-environment systems [3]. Another efficient strategy to extend the life of metallic-based materials and protect them against corrosion is the application of organic coatings [4–7].

In the present chapter, we interesting in the organic inhibitor category, which its protection ability is related to its adsorption onto the metal surface via electrostatic attraction or/and chemical bond formation, leading to the formation of a protective layer resulting in corrosion mitigation [8]. It is well known that the adsorption
