Effect of retrogression and re‐aging (RRA) heat treatment on the corrosion behavior of B206 aluminum–copper casting alloy

Pournazari, Shabnam; Deen, Kashif Mairaj; Maijer, Daan M.; Asselin, Edouard

doi:10.1002/maco.201709925

Cited by 7 publications

(6 citation statements)

References 51 publications

(78 reference statements)

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“…Corrosion was localized, and a galvanic couple between the eutectic silicon phase and/or Fe-rich intermetallic particles and aluminum matrix was observed ( Figure 13). These results are in accordance with the results of other researchers about corrosion of Al-Si alloys in similar solutions [21,25]. They solved this problem by applying surface modification by ground to eliminate an observed purely liquid microstructure´s surface due to the segregation surface which makes them more resistant to corrosion when ground and therefore without surface defects.…”

Section: Corrosion Resistance Of Cast Aluminum Alloys Obtained By Semsupporting

confidence: 91%

“…Tahamtan et al [45] observed that resistance to pitting corrosion was largely improved due to the reduced area ratio between noble silicon particles and the less-noble eutectic aluminum phase around silicon particles in a thixoformed A356 alloy in comparison with rheocasting and gravity cast These results are in accordance with the results of other researchers about corrosion of Al-Si alloys in similar solutions [21,25]. They solved this problem by applying surface modification by ground to eliminate an observed purely liquid microstructure´s surface due to the segregation surface which makes them more resistant to corrosion when ground and therefore without surface defects.…”

Section: Corrosion Resistance Of Cast Aluminum Alloys Obtained By Semsupporting

confidence: 80%

“…The alloys included in the 200 series can be heat treated due to their high Cu content. Pournazari et al [21] carried out a retrogression and re-aging heat treatment (RRA) on the A206 alloy and observed better behavior only in the first 48 h of immersion in NaCl, than when compared to the same alloy in an as-cast state. This issue is explained by a higher intensity of attack by intergranular exfoliation of heat-treated Alloy 206 as shown in Figure 9.…”

Section: Series 2xxxmentioning

confidence: 99%

See 2 more Smart Citations

Corrosion of Cast Aluminum Alloys: A Review

Labari

Biezma

Rivero

2020

Metals

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Research on corrosion resistance of cast aluminum alloys is reviewed in this article. The effect of the main microstructural features of cast aluminum alloys such as secondary dendrite arm spacing (SDAS), eutectic silicon morphology, grain size, macrosegregation, microsegregation, and intermetallic compounds is discussed. Moreover, the corrosion resistance of cast aluminum alloys obtained by modern manufacturing processes such as semi-solid and additive manufacturing are analyzed. Finally, the protective effects provided by different coatings on the aluminum cast alloys—such as anodized, plasma electrolytic oxidation (PEO), and laser—is reviewed. Some conclusions and future guidelines for future works are proposed.

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Section: Corrosion Resistance Of Cast Aluminum Alloys Obtained By Semsupporting

confidence: 91%

Section: Corrosion Resistance Of Cast Aluminum Alloys Obtained By Semsupporting

confidence: 80%

Section: Series 2xxxmentioning

confidence: 99%

See 1 more Smart Citation

Corrosion of Cast Aluminum Alloys: A Review

Labari

Biezma

Rivero

2020

Metals

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“…In the RRA process, the material is heat treated in short periods and at low temperature and then aged under the same conditions as T6 (120°C/24 hr). With RRA heat treatment, the material is resistant to corrosion while maintaining its mechanical strength . The strength value of the 7050 aluminium alloy treated with RRA can reach up to T6 treatment …”

Section: Introductionmentioning

confidence: 99%

Effects of retrogression and reaging heat treatment on the microstructure, exfoliation corrosion, electrical conductivity, and mechanical properties of AA7050

Özer

Kaya²,

Karaaslan

2019

Materials & Corrosion

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The effects of different retrogression times and temperatures on the microstructure, electrical conductivity, exfoliation corrosion (EXCO), and hardness of the 7050 aluminium alloy were compared with the T6 and T7451 condition. The EXCO solution was prepared in accordance with ASTM G34-01 standard and the samples were kept in the solution for 48 hr. Corrosion depths were examined by using scanning electron microscope (SEM) in the crosssections microstructure of the samples. The effect of EXCO on the material was investigated using stereo optical microscope images. In microstructure investigations, SEM and energy dispersive X-ray (EDX) analyses were used to determine the distribution and chemistry of the precipitates at the grain boundaries. The results show that retrogression and reaging (RRA) times and temperatures have significant effects on AA7050 EXCO. Especially after 200°C/ 30 min RRA process, it has been found that 7050 aluminium alloy has higher mechanical strength than T6 level and high corrosion resistance from T7451 level. According to the results of this study, it has been shown that there is a direct connection between electrical conductivity and EXCO. K E Y W O R D S AA7050, electrical conductivity, exfoliation corrosion, mechanical properties, retrogression and reaging

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“…It is considered that Cu 2+ ions and metallic copper in the material will increase the corrosion rate of the aluminum anode, and the θ phase (CuAl 2 ) in the interface layer is more susceptible to corrosion than the α phase (Al). Pournazari et al, Gravina et al, Coelho et al, and Cai et al, used accelerated corrosion to simulate the service conditions of Cu–Al composites, and studied the effects of different service conditions on the corrosion behavior of Cu–Al composites, to try and develop anticorrosion measures. A common theme of these studies is to place the materials in an environment that is close to the actual service conditions and to investigate the corrosion behavior and corrosion mechanism of the materials by accelerated corrosion.…”

Section: Introductionmentioning

confidence: 99%

Salt‐spray corrosion behavior of a Cu–Al composite plate under AC current

Cheng

Yuan

Huang

et al. 2019

Materials & Corrosion

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Cu–Al composite plate corrosion tests, under a 0–100 A AC current, were conducted for 48 hr in a neutral salt spray. The morphology and corrosion products were studied by scanning electron microscope and X‐ray powder diffraction, through which the effect of the current was analyzed. Meanwhile, the rate and degree of corrosion were evaluated by weight loss, electrochemical and electrolytic conductivity detection methods. The results showed that when the current increased, the corrosion rate initially increased and then decreased. When the current value was 50 A, the corrosion rate was the highest. The corrosion of the Cu–Al composite plate mainly included galvanic corrosion at the interface and pitting on the aluminum matrix, with no corrosion on the copper matrix. The state of the passivation film changed to loose, peeling, rupture, accumulation, compact, and so on when the current value increased. The type of corrosion product was not affected by the current value. The current affects the electromobility of the chloride ions by influencing the conductivity of the corrosion medium. The higher the electromobility of the chloride ions, the less the destruction of the passivation film and as a result, there is a decreased rate and degree of corrosion.

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Effect of retrogression and re‐aging (RRA) heat treatment on the corrosion behavior of B206 aluminum–copper casting alloy

Cited by 7 publications

References 51 publications

Corrosion of Cast Aluminum Alloys: A Review

Corrosion of Cast Aluminum Alloys: A Review

Effects of retrogression and reaging heat treatment on the microstructure, exfoliation corrosion, electrical conductivity, and mechanical properties of AA7050

Salt‐spray corrosion behavior of a Cu–Al composite plate under AC current

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