Bronze corrosion protection by long-chain phosphonic acids

• Published in: Corrosion science Vol. 205; p. 110445
• Main Authors: Mikić, Dajana, Ćurković, Helena Otmačić, Hosseinpour, Saman
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15-08-2022
• Subjects: A. Alloy; B. EIS; B. SEM; B.IR spectroscopy; C. acid inhibiton; B. SEM; B.IR spectroscopy; A. Alloy; C. acid inhibiton; B. EIS
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2022.110445

Bronze surfaces were modified by methyl, carboxyl and amino terminated phosphonic acids films to assess the impact of the terminal group and the film thickness on the corrosion resistance of coated samples. The structure of the adsorbed films was characterized by goniometry, specular IR, and SFG spectroscopy. Corrosion studies were conducted for three weeks of continuous immersion in acid rain solution using polarization measurements and electrochemical impedance spectroscopy. Films formed in 1mM solutions of phosphonic acids provided better corrosion protection than those formed in 0.1mM solutions. Carboxyl terminated phosphonic acid films exhibited the least protective film on bronze.
•bronze corrosion is significantly reduced by studied phosphonic acids films•thickness and structure of the films depends on solution concentration•both hydrophobic and hydrophilic films can provide long-term corrosion protection