Allyl thiourea as a corrosion inhibitor for cold rolled steel in H3PO4 solution

• Published in: Corrosion science Vol. 55; pp. 280 - 288
• Main Authors: Li, Xianghong, Deng, Shuduan, Fu, Hui
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.02.2012; Elsevier
• Subjects: A. Steel; Adsorption; Applied sciences; B. EIS; B. Polarisation; B. SEM; C. Acid inhibition; Cold rolling; Corrosion; Corrosion environments; Corrosion inhibitors; Corrosion prevention; Electrochemical impedance spectroscopy; Exact sciences and technology; Forming; Inhibition; Metals. Metallurgy; Production techniques; Rolling; Scanning electron microscopy; Steels; B. SEM; B. Polarisation; C. Acid inhibition; B. EIS; A. Steel; Scanning electron microscopy; Forming; Corrosion protection; Corrosion inhibitor; Cold rolling; Corrosion; Thiourea; Cold rolled sheet; Impedance; Organic compounds
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2011.10.025

► Allyl thiourea (ATU) acts as a good inhibitor for steel in 1.0M H3PO4. ► Inhibition efficiency increases slightly with the temperature at 0.2–0.5mM. ► The adsorption of ATU on steel surface obeys Langmuir adsorption isotherm. ► ATU behaves as a mixed-type inhibitor. The inhibition effect of allyl thiourea (ATU) on the corrosion of cold rolled steel (CRS) in 1.0M H3PO4 solution at 20–50°C was studied by weight loss, potentiodynamic polarisation, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) methods. The results show that ATU is a good inhibitor, and the maximum inhibition efficiency of 0.5mM inhibitor is higher than 95% at all studied temperatures. The adsorption of ATU obeys Langmuir adsorption isotherm. Polarisation curves show that ATU behaves as a mixed-type inhibitor. EIS spectra exhibit one capacitive loop. The inhibition action is also evidenced by SEM.