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

Abstract

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.

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

“…This technique can also determine the chemical state of the elements in the films. Some of the authors reported that hard metal cations were present in the passive films formed on aluminum and its alloys after immersion in model tap water by AES and XPS analysis [28]. However, the effect of the presence of metal cations in passive films or in the corroding solution on long term immersion corrosion behavior and polarization behavior of A3003 in model tap water is not fully elucidated.…”

Corrosion Mechanism and the Effect of Corrosion Time on Mechanical Behavior of 5083/6005A Welded Joints in a NaCl and NaHSO3 Mixed Solution

“…Sakairi et al [19] found that in the stage of oxide film formation, the oxide film consists of a gel-like structured hydrated oxide, which contains a large amount of bound wa- The spectrum of Al2p in Figure 10b,c is composed of three peaks with respective binding energies of 75.7 eV, 74.5 eV, and 73.9 eV [16,17] (the corresponding substances are AlCl 3 , Al 2 O 3 , and Al(OH) 3 ). Since Al 2 O 3 , the main component of the oxide film, is not a corrosion product formed in the corrosion process, the corrosion products of the 5083/6005A welded joints are Al(OH) 3 and AlCl 3 [18].…”

Corrosion inhibition of AA3003 aluminum alloy by self-assembled layers of myristic acid

“…However, in this type of application, the heat exchangers are exposed to the atmospheric environment, tap water with surfactants and salt solutions. Among the very few studies on corrosion of aluminum alloys in tap water, Sakairi et al (2013) investigated the changes in the structure and morphology of surface films formed on AA3003 aluminum alloy immersed in model tap waters. They observed that during 24 h, many nano-sized corrosion pits developed, with an average pit depth related to the type of metal cation present in the solution.…”