Development of smart oxidation and corrosion resistance of multi-doped complex hybrid coatings on mild steel

• Published in: Journal of alloys and compounds 2015-07, Vol.637, p.382-392
• Main Authors: Fayomi, O.S.I., Popoola, A.P.I.
• Format: Article
• Language: English
• Subjects: Alloys; Chlorides; Coatings; Composite; Corrosion resistance; Deposition; Hardness; Interfacial interaction; Multifunctional deposition; Titanium dioxide; Zinc; Zn–Al–SnO2–TiO2
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2015.02.154

•The structure and thermal treatment properties of chloride Zn–Al–SnO2–TiO2 (Zn–Al–Sn/Ti).•Thermal evaluation for 2h at 200°C, 400°C and 600°C.•The coatings were evaluated using AFM, SEM/EDS and XRD, the hardness and wear.•The best alloy value was obtained at Zn–Al–7Sn–Ti–0.3V–Cl system.•Zn–Al–7Sn–Ti–0.3V–Cl at 600°C for the thermal-corrosion samples. The microstructure, mechanical and thermal treatment behavior of Zn–Al–SnO2/TiO2 (Zn–Al–Sn/Ti) produced through chloride deposition system was studied. 7.0–13.0wt% TiO2 and SnO2 was added to chloride Zn–Al bath. A thermal treatment characteristic was done for 2h at 200°C, 400°C and 600°C. The ageing behaviors of the co-deposited alloys were evaluated using (SEM/EDS) and XRD. The hardness and wear value of the solid coatings were examined with micro-hardness and UMT-2 sliding tester respectively. The corrosion properties were investigated by linear polarization method in 3.65% NaCl environment. From the obtained results, the deposited alloys revealed excellent stability. The even distribution of the particulate on the produced coating and thermal-treatment were observed to cause the improvement on mechanical, tribological and electrochemical properties. The overall best coating was obtained at Zn–Al–7Sn–Ti–0.3V–Cl for as-coated and Zn–Al–7Sn–Ti–0.3V–Cl at 400°C for the thermo-mechanical treated samples. The hardness, corrosion and micro-mechanical resistance performance against the working substrate were depended on the development of coherent and regular precipitation from the incorporated strengthening particulate.