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- Title
Flake ZnAl Alloy as an Effective Pigment in Silicate Coatings for the Corrosion Protection of Steel.
- Authors
Hoang, Nguyen; Khoa, Truong Anh; Nhung, Le Thi; Phuong, Phan Minh; Binh, Tran Dinh; Hang, To Thi Xuan; Chi, Nguyen Van; Nguyen, Thanh-Danh
- Abstract
Spherical zinc is well known as an effective pigment for the corrosion protection of carbon steel. However, a high proportion of spherical Zn in a coating leads to difficulties in fabricating the coating solution and increased cost. In this work, the influence of flake ZnAl alloy in silicate coatings on the corrosion protection properties of steel substrates was investigated. The electrochemical behaviour of coatings containing different flake ZnAl alloy content immersed in NaCl solution (3.5 wt%) was evaluated using an electrochemical impedance spectroscopy (EIS) method. A salt spray test was performed to evaluate corrosion on the coating surface. Pull-off tests of the coatings before and after the salt spray process were performed, and the surface morphology was analysed to determine the degradation of corrosion resistance. The results show that silicate coating containing flake ZnAl alloy (25 wt%) possesses the highest total resistance (1417 Ω) and the longest time to the appearance of white rust (720 h). The surface morphology of the coating containing 25 wt% flake ZnAl alloy was found to include corrosion products with the most compacted surface, which effectively prevents the penetration of electrolytes to the interface between the coating and the steel.
- Subjects
SALT spray testing; STEEL corrosion; CARBON steel corrosion; PIGMENTS; CORROSION &; anti-corrosives; SURFACE coatings; ALLOYS; EPOXY coatings
- Publication
Coatings (2079-6412), 2022, Vol 12, Issue 8, p1046
- ISSN
2079-6412
- Publication type
Article
- DOI
10.3390/coatings12081046