Abstract
The corrosion inhibition characteristics of the derivatives of biopolymer hydroxypropyl methylcellulose (HPMC), hydroxypropyl methylcellulose phthalate (HPMCP), and hydroxypropyl methylcellulose acetate succinate (HPMCAS) film are investigated. Based on electrochemical impedance spectroscopic measurements and potentiodynamic polarization, the corrosion inhibition performance of high speed steel coated with HPMC derivatives is evaluated. The Nyquist plot and Tafel polarization demonstrate promising anti-corrosion performance of HPMC and HPMCP. With increasing film thickness, both materials reveal improvement in corrosion inhibition. Moreover, because of a hydrophobic surface and lower moisture content, HPMCP shows better anti-corrosion performance than HPMCAS. The study is of certain importance for designing green corrosion inhibitors of high speed steel surfaces by the use of biopolymer derivatives.
Highlights
There are three primary methods of corrosion control: reducing metal oxidation [1], decreasing corrosion of corrosive liquids [2], and isolating metal from the corrosive environment via dry films [3,4,5]
Several researchers have investigated the effects of polymeric corrosion inhibitors, such as polyamide compounds [9], polyacrylic acid [10], polymeric materials [11], and cellulosic polymers [12], which show considerable promised anticorrosion behavior
The objective of the present study is to evaluate the anti-corrosion performance of biopolymer hydroxypropyl methylcellulose (HPMC) derivatives in a saline solution
Summary
There are three primary methods of corrosion control: reducing metal oxidation [1], decreasing corrosion of corrosive liquids [2], and isolating metal from the corrosive environment via dry films [3,4,5]. The common approach is to add corrosion inhibitors to form a physical adsorption layer on the surface, thereby blocking the penetration of active substances and reducing corrosion [6,7,8]. According to the requirements of the Paris climate agreements and sustainable development, extensive studies on green materials for anti-corrosive films have recently been conducted [13,14,15,16]. Owing to its high film forming ability [17]
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