Al-Zn-Mg系合金のアノード分極挙動に及ぼす表面粗度の影響
1990 年 40 巻 2 号 p. 131-137
詳細
1990 年 40 巻 2 号 p. 131-137
The effect of surface roughness of Al-Zn-Mg alloy on passivation and corrosion behaviors was investigated by measuring anodic polarization curves in 0.5N NaCl solution. It is shown that pitting potential tends to shift less noble and passivation current density increases with increase of surface roughness. It is found thet there is a border line for the surface roughness (Rmax) between 5 and 10μm where the pitting potential and the passivation current density change sharply in 0.5N NaCl solution. It is considered from the results of polarization behavior that the pitting corrosion resistance of a passivation film on a specimen decreases remarkably at the surface roughness beyond 30μm.
