Elsevier

Corrosion Science

Volume 37, Issue 9, September 1995, Pages 1423-1441
Corrosion Science

The inhibition of corrosion of S30403 stainless steel by a naturally occurring catecholic polymer

https://doi.org/10.1016/0010-938X(95)00050-TGet rights and content

Abstract

Corrosion measurements based on cyclic potentiodynamic polarization indicate that a catecholic mussel adhesive protein adsorbed on to S30403 stainless steel coupons confers significant corrosion inhibition on the metal compared with other adsorbates tested. This inhibition is concentration dependent, with a maximum measured concentration effect occurring at a 1.0 mg/ml solution concentration. This effect results in a reduction of weight loss of more than 50% in both the polarization measurements and in acidic ferric chloride measurements for 72 h. A synthetic analog of the mussel protein with a bottle brush configuration, instead of the tandem linear array of decapeptide repeats characteristic of the natural protein, showed no inhibitory effect on the corrosion of stainless steel samples. This suggests that the molecular configuration of the natural protein may be as important as its functional chemistry in the inhibition of corrosion of S30403 stainless steel.

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      Further laboratory investigation and evaluation of the inhibitor in specific environmental conditions are of great importance for security reason, along with feasibility and economic considerations. We have found a mussel adhesive protein (MAP) extracted from blue mussels possesses adhesive, film-forming and corrosion protective properties to steels [21–24]. It has been developed as both free corrosion inhibitor [23] and film-forming corrosion inhibitor [24], which provide significant corrosion protection for the carbon steel.

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      The Mytilus edulis foot protein-1 (MeFP-1), the largest of the byssus proteins and containing 15 mol % of the catecholic amino acid L-3,4 dihydroxyphenylalanine (l-Dopa) [8] has been investigated in numerous studies as a corrosion inhibitor. In one study, the corrosion inhibition provided by MeFP-1 adsorbed onto 304 L (S30403) stainless steel was found to be greater than the corrosion inhibition provided by bovine serum albumin (BSA), 3,4-dihydroxybenzoic acid, and poly-l-lysine using cyclic potentiodynamic curves and pit depth measurements [9]. A second study compared the corrosion inhibition of a commercial preparation of MeFP-1 to BSA on carbon steel using electrochemical impedance spectroscopy (EIS) and atomic force microscopy (AFM) [10]; in that study, it was demonstrated that MeFP-1 and BSA provided comparable corrosion inhibitor for carbon steel in acidic (pH 4.6) solution conditions.

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    Present address: Naval Research Laboratory Code 6314 4555 Overlook Avenue, Washington, DC 20375-5343, U.S.A.

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