Corrosion resistant films were fabricated on Al-Zn-Mg alloy by steam coating using Zn(NO3)2 aqueous solution at different concentrations. XRD patterns and FT-IR spectra demonstrated that nitrate type Zn-Al layered double hydroxide (LDH) and ZnO films were formed on the Al-Zn-Mg alloys by steam coating at the temperatures of 373 to 433 and 473 K, respectively, using Zn(NO3)2 aqueous solution at 1000 mM. γ-AlO(OH) films were found to be prepared on the Al-Zn-Mg alloys by steam coating at 513 K using Zn(NO3)2 aqueous solutions at the concentrations of 1 to 100 mM. The corrosion resistance of the films was investigated by potentiodynamic polarization curve measurements. The polarization curve measurements revealed that the γ-AlO(OH) films prepared by steam coating at 513 K using 1 mM of Zn(NO3)2 aqueous solution was most effective to suppress pitting corrosion and anodic current density.
|ジャーナル||Keikinzoku/Journal of Japan Institute of Light Metals|
|出版ステータス||Published - 2018|
ASJC Scopus subject areas