Abstract
Corrosion inhibition of aluminum (Al) in hydrochloric acid by anionic polyeletrolyte pectates (PEC) as a water-soluble natural polymer polysaccharide has been studied using both gasometric and weight loss techniques. The results drawn from these two techniques are comparable and exhibit negligible differences. The inhibition efficiency was found to increase with increasing inhibitor concentration and decrease with increasing temperature. The inhibition action of PEC on Al metal surface was found to obey the Freundlich isotherm. Factors such as the concentration and geometrical structure of the inhibitor, concentration of the corrosive medium, and temperature affecting the corrosion rates were examined. The kinetic parameters were evaluated and a suitable corrosion mechanism consistent with the kinetic results is discussed in the paper.
Highlights
IntroductionAluminum (Al) and its alloys are low cost and remarkable materials in industrial technology because of their light weight, high thermal and electrical conductivity as well as high resistance to corrosion in a wide variety of corrosive environments
Aluminum (Al) and its alloys are low cost and remarkable materials in industrial technology because of their light weight, high thermal and electrical conductivity as well as high resistance to corrosion in a wide variety of corrosive environments.Generally, the corrosion resistance of metals, such as Al and steel, in corrosive environments, may be attributed to the formation of a protective tightly adhered invisible oxide film on the metal surface.The film reduces or prevents the corrosion of such metals
The volume of evolved hydrogen as a function of time is defined as the rate of dissolution of Al in hydrochloric acid and can be expressed as Equations (1) and
Summary
Aluminum (Al) and its alloys are low cost and remarkable materials in industrial technology because of their light weight, high thermal and electrical conductivity as well as high resistance to corrosion in a wide variety of corrosive environments. Carboxymethyl cellulose [21] as natural polymeric compounds, and polyacrylic acid [22] as a synthetic polymer containing alcoholic groups, have been successfully applied as corrosion inhibitors of steel in acidic media. The study aimed to elucidate a suitable mechanism for corrosion of Al in acidic medium and discuss the results in comparison with previously reported studies on use of the natural polymer pectate polysaccharide as inhibitor for corrosion of Al in alkaline solutions [16]
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