Corrosion resistance of a two-stage stress-aged Al–Cu–Mg alloy: Effects of stress-aging temperature

Lin, Y.C.; Guan, Lan; Chen, Mingsong; Huang, Yuanchun; Chen, Zhiguo; Ma, Xiang; Jiang, Yu-Qiang; Li, Jia

doi:10.1016/j.jallcom.2015.10.114

Cited by 40 publications

(14 citation statements)

References 51 publications

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“…The effect of grain size (D) can be better visualized by the Hall-Petch plot as can be obtained. Some representative polarization curves are shown in figure 3(a), where the corrosion current density (i corr ) was obtained by the Tafel extrapolation method [21][22][23][24][25][26][27][28] according to the anodic and cathodic extrapolation lines shown in figure 3(a). The results are summarized in figure 3(b), where by grain refinement, it can be seen that i corr firstly increased slowly but increased rapidly afterwards.…”

Section: Resultsmentioning

confidence: 99%

Effect of grain size on the corrosion resistance of low carbon steel

Soleimani

Mirzadeh

Dehghanian

2020

Mater. Res. Express

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Systematic works on the effect of grain size on the corrosion resistance of low carbon steel are scant. In the present work, a spectrum of grain sizes was obtained by simple heat treatment routes in a typical low-carbon steel. It was revealed that two distinct stages for the dependency of corrosion current density (i corr ) on the grain size exist. Above a limiting average grain size of ∼22 μm, i corr decreased slowly with increasing grain size. However, below this limiting value, i corr increased rapidly, which was related to the increased density of grain boundaries as interpreted by theoretical calculation of number of grains per unit area. Conclusively, a grain size of ∼22 μm (ASTM grain-size number of 8) was considered to be an optimum value according to the mechanical and corrosion standpoints.

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Section: Resultsmentioning

confidence: 99%

Effect of grain size on the corrosion resistance of low carbon steel

Soleimani

Mirzadeh

Dehghanian

2020

Mater. Res. Express

View full text Add to dashboard Cite

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“…The electrochemical corrosion parameters derived from the polarization curves are shown in Figure 6 . Here, the derived parameters are corrosion potential ( E corr ) and the corrosion current density ( i corr ), which are obtained based on Tafel extrapolation method [ 21 , 22 ]. Therefore, the corrosion potential and the current density of the as-received alloy can be evaluated as −0.853V SCE and 1.674 × 10 −5 A/cm 2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The corrosion rate of the alloy is proportional to the corrosion current density, which can be calculated by [ 21 , 24 ]:

where

is a conversion factor (3.27 × 10 −3 mm/(μA·cm·y));

is the molar mass of the metal (26.98 g/mol);

is the number of electrons exchanged in the dissolution reaction (3/mol);

is the density of the studied AlSi10Mg(Cu) alloy and its value is 2.68 g/cm 3 .…”

Section: Resultsmentioning

confidence: 99%

“…The corrosion potential represents the nucleation of metastable pits and the breakdown of the oxide layer which covers on the surface of aluminum matrix [ 21 ]. From Figure 6 , it can be found that the corrosion potential increase from −0.853 V SCE (as-received alloy) to −0.849 V SCE (180 °C for 90 h), when the exposure temperature is increased to 270 °C, the corrosion potential further increase to −0.817 V SCE (for 90 h).…”

Section: Discussionmentioning

confidence: 99%

“…This indicates that the occurrence of metastable pits is more difficult when the exposure temperature is relatively higher (270 °C). Compared with the as-received alloy, the thermal exposure processing can change the density and size of precipitates in the Al matrix, resulting in the relatively high corrosion potential [ 21 ].…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructure Evolution of AlSi10Mg(Cu) Alloy Related to Isothermal Exposure

et al. 2018

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The mechanical properties and corrosion resistance changes of AlSi10Mg(Cu) alloy under different isothermal exposure conditions have been investigated by tensile experiments and electrochemical testing. The results show that isothermal exposure has a significant influence on the mechanical properties and corrosion resistance. Tensile strength is more sensitive to the higher exposure temperature, while the corrosion resistance is greater affected by the lower exposure temperature and shorter time. Microstructure evolution of AlSi10Mg(Cu) alloy related to different isothermal exposure condition has also been studied by using transmission electron microscopy (TEM). The results indicate that the isothermal exposure changed the type and density of nanoscale precipitates in the alloy, which in turn induced the change of performance of the alloy.

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Influence of Stress‐Aging Processing on Precipitates and Mechanical Properties of a 7075 Aluminum Alloy

et al. 2017

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Two‐step stress‐aging tests, as well as pre‐treatment plus stress‐aging experiments, are performed on a 7075 aluminum (Al–Zn–Mg–Cu) alloy. Influences of stress‐aging parameters on mechanical behavior and fracture mechanism are investigated through uniaxial tensile test and fracture morphology analysis. It is revealed that the stress‐aging dramatically influences the mechanical properties and fracture characteristics of the studied alloy, which is contributed to the sensitivity of microstructures to stress‐aging. When the alloy undergoes two‐step stress‐aging, the ultimate tensile strength and yield strength first increase and then decrease with the increased first step stress‐aging temperature, while the elongation first decreases and then increases. For the retrogression pre‐treated plus stress‐aged alloy, the yield strength first increases and then drops with the increased retrogression pre‐treatment time, while the ultimate tensile strength almost remains stable. Furthermore, the elongation continuously increases with the increased retrogression pre‐treatment time. The observation of fracture morphology indicates that the dimple‐type intergranular fracture is the main fracture mechanism for the two‐step stress‐aged and retrogression pre‐treated plus stress‐aged alloys.

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Corrosion resistance of a two-stage stress-aged Al–Cu–Mg alloy: Effects of stress-aging temperature

Cited by 40 publications

References 51 publications

Effect of grain size on the corrosion resistance of low carbon steel

Effect of grain size on the corrosion resistance of low carbon steel

Microstructure Evolution of AlSi10Mg(Cu) Alloy Related to Isothermal Exposure

Influence of Stress‐Aging Processing on Precipitates and Mechanical Properties of a 7075 Aluminum Alloy

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