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Enhanced corrosion resistance of Zn–Cu–Ti alloy with addition of Cu–Ti amorphous ribbons in 3.5% NaCl solution
Author(s) -
Ni Ya,
Wu Guoguang
Publication year - 2021
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.202012159
Subject(s) - corrosion , materials science , alloy , microstructure , equiaxed crystals , amorphous solid , metallurgy , amorphous metal , grain boundary , polarization (electrochemistry) , crystallography , chemistry
Abstract In the present study, Zn–0.3Cu–0.3Ti alloy (sample I) was fabricated by a simple low‐temperature melting method using Cu–50Ti amorphous alloy ribbons for corrosion in 3.5% NaCl solution. As a comparison, crystalline Cu–50Ti master alloy was used to prepare Zn–0.3Cu–0.3Ti alloy (sample II). Sample I comprising Zn, TiZn 3 , and TiZn 15 phases exhibits an equiaxed microstructure with subgrain structure. Large TiZn 3 particles show cluster feature, whereas intermittent small TiZn 15 particles exist at grain boundaries and subgrain boundaries. In sample II, the Zn matrix with typical dendritic microstructure is observed and no large particles are found. Compared with sample II, sample I shows lower weight gain and corrosion current density and a higher slope of cathode polarization curve. The weight gain for sample I is only 0.59 mg·cm −2 , but for sample II, this value reaches 0.70 mg·cm −2 . After 8 days of corrosion, corrosion products are mainly Zn 5 (OH) 8 Cl·H 2 O and ZnO, showing loose particle shape. As corrosion time increases from 2 days to 8 days, corrosion layer thickness increases from about 15 to 24 μm for sample 1.