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Enhanced corrosion resistance properties of 15Al-85Zn coating by post-treatment with sodium hexa-meta phosphate in saline solution
- Authors
- Singh, Jitendra Kumar; Lee, Han-Seung
- Issue Date
- Jan-2024
- Publisher
- Elsevier Ltd
- Keywords
- Coating; Corrosion; Electrochemical impedance spectroscopy (EIS); Porosity; Scanning electron microscopy (SEM); Steel; X-ray diffraction (XRD)
- Citation
- Corrosion Science, v.226, pp 1 - 17
- Pages
- 17
- Indexed
- SCOPUS
- Journal Title
- Corrosion Science
- Volume
- 226
- Start Page
- 1
- End Page
- 17
- ISSN
- 0010-938X
1879-0496
- Abstract
- Different amounts of sodium hexametaphosphate (SHMP: Na6[(PO3)6]) has been used to fill the defects and pores of arc thermal sprayed 15Al-85Zn coating. 73.39% porosity is reduced by 0.1 M SHMP post-treated coating due to formation of hydrogen zinc phosphate hydrate (HZP: HZn4(PO4)3H2O). The corrosion resistance of post-treated coating is increased in 3.5 wt% NaCl solution with immersion periods attributed to the transformation of HZP into zinc phosphate (Zn3(PO4)2) as well as active Zn react with Cl- and form simonkolleite (Zn5(OH)8Cl2·H2O). Simonkolleite and zinc phosphate are sparingly soluble, therefore, post-treated coating provides two folds’ protection by HZP and corrosion products. © 2023 Elsevier Ltd
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Related Researcher
- Lee, Han Seung
- ERICA 공학대학 (MAJOR IN ARCHITECTURAL ENGINEERING)