Al2O3–TiO2 composite coatings with enhanced anticorrosion properties for 316L stainless steel. Issue 9 (23rd March 2020)

• Record Type: Journal Article
• Authors: Dai, Jiamin; Yang, Jiaqi; Zhuge, Lanjian; Wu, Xuemei
• Is Part Of: Materials and corrosion. Volume 71:Issue 9(2020)
• Page Start: 1512
• Page End: 1520
• Publication Date: 2020-03-23
• Subjects: 316L stainless steel -- Al2O3–TiO2 composite coating -- anticorrosion -- magnetron sputtering; Materials -- Periodicals; Metals -- Periodicals; Corrosion and anti-corrosives -- Periodicals; 620.1122305
• DOI: 10.1002/maco.201911449
• Languages: English
• ISSNs: 0947-5117

Abstract

Abstract: 316L stainless steel is used as an important structural material in various industries. However, its service life is limited in the presence of chloride ions due to severe chemical corrosion. Herein, a facile radiofrequency magnetron sputtering process is reported for the synthesis of various Al2 O3 –TiO2 composite coatings as an anticorrosion layer for 316L stainless steel substrates. The enhanced chemical stability of Al2 O3 –TiO2 composite coatings was investigated by X‐ray photoelectron spectroscopy, electron paramagnetic resonance, and X‐ray diffraction measurements. Moreover, the high specific surface area of Al2 O3 –TiO2 composite coatings displayed better hydrophobic property which can be confirmed by scanning electron microscopy and contact angle measurements. Finally, the direct characterization of anticorrosion properties was carried out using electrochemical tests. All of the above results exhibited the enhanced anticorrosion properties of Al2 O3 coating after the incorporation of TiO2 . Significantly, the Al2 O3 –TiO2 composite coatings with 15.56% Ti content provided the best corrosion resistance for 316L stainless steel. Abstract : Al2 O3 –TiO2 composite coatings synthesized by a facile radiofrequency magnetron sputtering process with decreased concentration of oxygen vacancies, well‐distributed morphology, and improved crystal structure displayed enhanced anticorrosion properties for 316L stainless steel, which can be well reflected by the electrochemical parameters derived from the potentiodynamic polarization curves and electrochemical impedance spectra.