Effect of quality of tap-water on corrosion attacks of aluminum utensils.

J Solid State Electrochem

Sasaki

et al. 2013

The effect of the metal cations, Na + , K + , Ca 2+ , Mg 2+ , Zn 2+ , and Ni 2+ , on the oxide film structure and morphology changes during long term immersion corrosion tests of aluminum alloy (A3003) in model tap waters was investigated by X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy. The effect of the metal cations on the corrosion behavior was also investigated with mass change and electrochemical tests. The hardness of the metal cations, X, based on the Hard and Soft Acids and Bases (HSAB) concept was applied to explain the effect of metal cations on the passive oxide film structure and corrosion resistance. The mass change rate and corrosion current density decreased with increasing metal cation hardness. The XPS results showed that hard metal cations like Zn 2+ and Ni 2+ were incorporated in the oxide films, while the four soft metal cations were not incorporated in the oxide films.The results are in good agreement with those which could be expected from the HSAB hardness of the metal cations.

Section: Introductionmentioning

confidence: 99%

Effect of metal cations on corrosion behavior and surface film structure of the A3003 aluminum alloy in model tap waters

J Solid State Electrochem

Sasaki

et al. 2013

“…Corrosion sometimes occurs on aluminum alloys in tap water despite the low concentration of chloride ions in the tap water. A few studies have shown the corrosion behavior of aluminum alloys in tap water [1][2][3][4][5][6] . Tohma et al investigated the corrosion of aluminum alloys in model tap water and actual tap water 7) .…”

Section: Introductionmentioning

confidence: 99%

Effect of a Kind of Metal Cation on Corrosion Mechanism of A3003 Aluminum Alloy in Tap Water

Kaneko³

2016

Mater. Trans.

Effect of a kind of metal cation on corrosion mechanism of A3003 aluminum alloy in tap water was investigated by electrochemical techniques and immersion corrosion tests. Corrosion rate of the aluminum alloy decreased with increase in a hardness of cation, except for Mg 2+ . XPS analyses showed metal cations, classi ed as a hard acid in tap water were incorporated in hydroxides on the aluminum alloy. The results suggest that the incorporated cations have corrosion inhibitory effect (e.g., Ca 2+ and Zn 2+ ) or corrosion promotive effect (e.g., Mg 2+ ). These different effects can be explained by difference in molar volume between hard metal cation s hydroxide and aluminum hydroxide.

“…Generally, the corrosion rate of aluminum in neutral aqueous environments is considered to depend mainly on the concentration of chloride ions. A few papers related to corrosion of aluminum and its alloys in tap water or model tap water . Sakaida et al .…”

Section: Introductionmentioning

confidence: 99%

Analysis of chemical compositions and morphology of surface films formed on 3003 aluminum alloy by immersion in different cation containing model tap waters

Surface & Interface Analysis

Kaneko³

et al. 2013

The effect of metal cations, Na + , K + , Ca 2+ , Mg 2+ , Zn 2+ , and Ni 2+ , on oxide film structure and morphology changes during immersion corrosion tests of 3003 aluminum alloy in model tap waters was investigated by surface analysis techniques including Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy. The hardness of metal cations based on the hard and soft acids and bases (HSAB) concept was applied to explain the effect on the passive oxide film structure. Numerous nano-sized pits were observed after 86.4 ks immersion in model tap water, and nano-sized corrosion products were also observed especially in specimens immersed in K + containing solutions. The AES and XPS results showed that hard metal cations like Zn 2+ and Ni 2+ were included in the oxide films, while soft metal cations were not included in the oxide films. The results are in good agreement with those which could be expected from the HSAB hardness of the metal cations.