Synergistic effect of gamma-ray irradiation and calcium oxide on corrosion inhibition of aluminum dihydric tripolyphosphate on mild steel

• Published in: Radiation effects and defects in solids Vol. 175; no. 5-6; pp. 504 - 515
• Main Authors: Song, Weiqiang, Liang, Gaoqiang, Wei, Cong, Guo, Wei, Ma, Xi, Yang, Lantao, Lin, Haowei
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 03-05-2020; Taylor & Francis Ltd
• Subjects: Aluminum; Aluminum dihydric tripolyphosphate; Calcium; Calcium oxide; Corrosion; Corrosion effects; corrosion inhibition; Corrosion inhibitors; Corrosion prevention; Efficiency; Electrochemical impedance spectroscopy; Electrochemistry; Gamma irradiation; Gamma ray sources; gamma-ray irradiation; Irradiation; Lamellar structure; Lime; Loosening; Low carbon steels; Morphology; Neutralization; Sodium chloride; Steel; Synergistic effect
• ISSN: 1042-0150; 1029-4953
• DOI: 10.1080/10420150.2019.1691550

Aluminum dihydric tripolyphosphate (ADTP) was irradiated by using a
60
Co gamma-ray source and a maximum dose up to 150 kGy, subsequently recombined with calcium oxide (CaO) by co-grinding, and the synergistic effects of gamma-ray irradiation and CaO on the anticorrosive performance of irradiated-ADTP on mild steel were studied. The efficiency of irradiated-ADTP and irradiated-ADTP/CaO as corrosion inhibitors for mild steel boards in 3.5% NaCl solution was determined by means of weight-loss determination, Tafel polarization and electrochemical impedance spectroscopy (EIS). The morphology of the irradiated-ADTP particles was observed by scanning electron microscopy (SEM). Results showed that irradiated-ADTP/CaO had good inhibiting properties for steel corrosion in the solution, with an efficiency of around 95% at gamma-ray absorbed dose of 150 kGy. But, the inhibiting efficiency of irradiated-ADTP in the absence of CaO decreased with the dose. The positive effect of the combination of gamma-ray irradiation and CaO was mainly attributed to the loosening lamellar structure of ADTP caused by gamma irradiation, which facilitated the neutralization reaction between ADTP and CaO.