Grafted Biopolymers as Corrosion Inhibitors

1 CorrosionBasics, Economic Adverse Effects, and its Mitigation

Rahul Singh and Dwarika Prasad^*Department of Chemistry, Shri Guru Ram Rai University, Dehradun - 248001, INDIA

^*Corresponding author

1.1 The Basics of Corrosion

Corrosion is a natural phenomenon that is responsible for the loss of material across the globe, resulting in a loss of approximately 26.1 billion dollars worldwide. Chemically it is expounded as the process of deposition of a layer of oxides or sulfides or chlorides on the surface of materials. Before, corrosion was only studied concerning the degradation of metal surfaces, but nowadays studies also extend to the degradation of plastics and polymers naturally over course of time. The process occurs spontaneously without the requirement of any external factor like catalyst or temperature or energy; where there is moisture there exists corrosion. In fact, in absence of moisture corrosion of steel which results in its cracking is observed, it is mainly due to exposure to di-hydrogen gas which as effect releases methane by reacting with carbon present in steel, categorized as “dry-corrosion.” The chemistry of the redox reaction is followed in which one part acts as an anode while another part acts as a cathode. Degradation usually occurs at the anode where oxidation occurs while deposition of oxidation products is usually observed at the cathode where reduction takes place. It is just like a typical galvanic cell. Corrosion is a slow process; it takes days ...