Effects of surface micro–galvanic corrosion and corrosive film on the corrosion resistance of AZ91–xNd alloys

Yin, Zhixiang; He, Runlian; Chen, Yang; Zhang, Yin; Yan, Kun; Wang, Kun; Yan, Hong; Song, Honggun; Yin, Chengxin; Guan, Hongyu; Luo, Cheng; Chassagne, Luc

doi:10.1016/j.apsusc.2020.147761

Cited by 60 publications

(23 citation statements)

References 43 publications

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“…Due to the presence of stray current, the potential difference between duplex phases is prone to form a microgalvanic coupling, which promotes the dissolution of local regions. [ 46 ]…”

Section: Resultsmentioning

confidence: 99%

Electrochemical corrosion behavior of Ti‐3Mo alloy under different accelerated corrosion tests

Huang¹,

Zheng²,

Fu³

et al. 2022

Materials & Corrosion

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The electrochemical corrosion behavior of Ti-3Mo alloys under different accelerated corrosion tests including seawater corrosion, soil corrosion, and stray current corrosion was investigated. Results showed that the i corr value gradually increased with the increase of NaCl/Na 2 SO 4 concentration, indicating a worsening corrosion resistance of Ti-3Mo alloy. The presence of stray current seriously destroyed the oxide film on the sample surface, and inhibited the regeneration of oxide film, thereby resulting in the deterioration of corrosion resistance. Besides this, the potential difference between duplex phases was prone to form a microgalvanic coupling, which promoted the dissolution of local regions.

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“…Due to the presence of stray current, the potential difference between duplex phases is prone to form a microgalvanic coupling, which promotes the dissolution of local regions. [ 46 ]…”

Section: Resultsmentioning

confidence: 99%

Electrochemical corrosion behavior of Ti‐3Mo alloy under different accelerated corrosion tests

Huang¹,

Zheng²,

Fu³

et al. 2022

Materials & Corrosion

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show abstract

“…Magnesium is easy to form an oxide film on the surface of magnesium alloy in air because of its active chemical characteristics. This oxide film is mainly composed of MgO, the Pilling-Bedworth ratio of MgO/Mg is about 0.8 [47,48], this oxide film has weak protective effect on matrix. MgO easily reacts with H 2 O to form Mg(OH) 2 in 3.5% NaCl aqueous solution [40], as shown in formula (6), Mg(OH) 2 accumulates on the surface of the specimen to form a corrosion products film.…”

Section: Corrosion Mechanismmentioning

confidence: 99%

Effect of aging treatment on corrosion behavior of Mg-4Nd-2Gd-0.5Zr alloy

Liu

Chen

et al. 2022

Mater. Res. Express

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The effects of aging time on corrosion behavior of Mg-4Nd-2Gd-0.5Zr alloy in 3.5% NaCl solution were investigated by microanalysis, weight loss test and electrochemical test. The results show that the corrosion rate of Mg-4Nd-2Gd-0.5Zr alloy decreases first and then increases with the extension of aging time. Aging treatment alters the grain size and the distribution of the second phases. The second phases and grain size are the key factors affecting the corrosion rate of magnesium alloy. Among the tested alloys, the T6-8 h alloy shows the lowest corrosion rate, which is mainly attributed to the continuous distribution of second phases restricting the expansion of corrosion, hence the T6-8 h alloy showed the highest corrosion resistance. The corrosion rate of T6-16 h alloy increases obviously because of the growth of the grain size and the segregation of second phases, which accelerates the corrosion progress.

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“…[7,8] At present, SKPFM is widely used in the corrosion resistance research of duplex stainless steels and alloys. [9][10][11][12][13][14][15] Research of Sathirachinda et al [10] showed that ferrite in 2205 duplex stainless steel at low Volta potential will be preferentially dissolved in acid chloride solution, pitting corrosion also occurred preferentially in ferrite. However, according to the study of Schmutz et al, [16][17][18][19] the experimentally measured surface electronic work function (EWF) can indicate the relative stability of each phase in the alloy and the tendency of corrosion and dissolution.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface Volta potential of Cr‐containing steel on uniform corrosion and pitting corrosion

Yuan

2021

Materials & Corrosion

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The corrosion behavior of 5.5%Cr-8.5%Cr steels in a CO 2 environment was studied. To clarify the effect of Volta potential on uniform corrosion and pitting corrosion, weight loss test, electrochemical measurement, scanning electron microscope, energy dispersive spectrometer, confocal laser scanning microscope, and scanning Kelvin probe force microscope were conducted. The results show that there is a linear relationship between the surface potential of the steel substrate and the self-corrosion potential. The increase of the Cr content reduces the surface potential and increases the self-corrosion potential, reducing the thermodynamic tendency of corrosion. The Al-oxide inclusions show lower potential than the substrate, and their sensitivity to pitting corrosion is affected by the potential difference with the substrate. The larger the potential difference, the easier it is tantamount to induce pitting corrosion.

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Effects of surface micro–galvanic corrosion and corrosive film on the corrosion resistance of AZ91–xNd alloys

Cited by 60 publications

References 43 publications

Electrochemical corrosion behavior of Ti‐3Mo alloy under different accelerated corrosion tests

Electrochemical corrosion behavior of Ti‐3Mo alloy under different accelerated corrosion tests

Effect of aging treatment on corrosion behavior of Mg-4Nd-2Gd-0.5Zr alloy

Effect of surface Volta potential of Cr‐containing steel on uniform corrosion and pitting corrosion

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