Corrosion Resistance of Phytic Acid/Benzotriazole Composite Conversion Film on a Copper Surface

• Published in: Russian journal of electrochemistry Vol. 60; no. 7; pp. 557 - 570
• Main Authors: Yong Lin, Guo, Yongxin, Liang, Jhih H., Yang, Zhongyu, Bian, Da, Zhao, Yongwu
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.07.2024; Springer Nature B.V
• Subjects: Acid resistance; Benzotriazole; Chelates; Chemistry; Chemistry and Materials Science; Contact angle; Copper; Copper converters; Corrosion currents; Corrosion effects; Corrosion resistance; Electrochemistry; Galvanic corrosion; Hydrogen bonds; Physical Chemistry; Phytic acid; Synergistic effect; Wettability; conversion film; phytic acid; electrochemistry; benzotriazole
• ISSN: 1023-1935; 1608-3342
• DOI: 10.1134/S1023193524700186

Phytic acid (PA) benzotriazole composite conversion films with different concentrations of BTA were prepared by an impregnation method, and their wettability, microstructure, and corrosion resistance were studied. The results showed that when the BTA content was 1.6 wt %, the maximum water contact angle of the conversion film reached 137.5°, and the corrosion current density reached a minimum of 1.610 × 10 –7 A/cm 2 . The salt spray and corrosive liquid environments experimental results also showed that the synergistic effect of PA and BTA was the best when the BTA concentration was 1.6 wt %. Hydrogen bonds are formed between PA chelates and BTA chelates enhancing the density of the conversion film leading to the improvement of corrosion resistance of conversion film on a copper surface with the introduction of BTA.