Nickel partitioning in ZnNi coatings (Ni less than 4 wt.%) and its effect on the coating corrosion behaviour.

Autor: Jyotheender, K. Sai, Mathai, Manu, Makineni, Surendra Kumar, Srivastava, Chandan
Předmět:
Zdroj: Philosophical Magazine; Sep2023, Vol. 103 Issue 18, p1701-1716, 16p
Abstrakt: ZnNi alloy coatings with low Ni content (1–4 wt.% Ni) were electrodeposited over mild steel. Ni addition changed the coating morphology from faceted to hillock, decreased the crystallite size, and shifted the basal plane texture to higher energy (01 1 ¯ 1) texture. Zn-1.5 wt.% Ni coating exhibited significantly improved corrosion resistance, even better than the pristine Zn coating. The corrosion resistance properties, however, degraded considerably as the Ni content increased (2.7 and 3.7 wt% Ni). The high corrosion resistance of the Zn-1.5 wt.% Ni coatings was due to the presence of nearly basal texture, low coating strain and evolution of stable γ-phase in the Zn matrix. The corrosion rate for higher Ni addition increased due to high energy surface texture and higher coating strain. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index