A study on preparation and corrosion behavior of nano rare earth oxide‐modified chromized coatings. Issue 2 (4th September 2019)

• Record Type: Journal Article
• Authors: Wang, Qin‐Ying; Tang, Yi‐Rong; Pei, Rui; Xi, Yu‐Chen; Wan, Shanhong
• Is Part Of: Materials and corrosion. Volume 71:Issue 2(2020)
• Page Start: 249
• Page End: 257
• Publication Date: 2019-09-04
• Subjects: chromized coating -- corrosion resistance -- electrochemical behavior -- Mott–Schottky plot -- nano rare earth oxide; Materials -- Periodicals; Metals -- Periodicals; Corrosion and anti-corrosives -- Periodicals; 620.1122305
• DOI: 10.1002/maco.201911017
• Languages: English
• ISSNs: 0947-5117

Abstract

Abstract: The corrosion resistance of carbon steel in a harsh environment was improved by preparing a chromized coating on the surface through the method of pack cementation. Nano rare earth‐oxides (NREOs), Y2 O3, CeO2, and La2 O3 were added to the pack and to further enhance the performance of the chromized coatings. Morphological results showed that NREO refined the microstructure of chromized coatings by retarding the growth of grains. The Mott–Schottky plots demonstrated that coating Cr–La2 O3 displayed fewer defects than the other two composite coatings, which was beneficial to reduce the corrosion tendency. In addition, the potentiodynamic polarization and impedance spectroscopy analysis showed that the order of the corrosion rates of the achieved coatings was pure Cr > Cr–Y2 O3 > Cr–CeO2 > Cr–La2 O3, which revealed that the corrosion resistance increased accordingly. Abstract : The microstructure of the chromized coatings was refined by nano rare earth‐oxides (NREOs) through retarding the growth of grains. The NREO‐modified chromized coatings displayed fewer defects and higher corrosion resistance than the pure chromized coating.