Effects of pre‐corrosion on mechanical properties of 7B50‐T7751 aluminum alloy in sodium chloride solution

Xu, Xingchen; Liu, Daoxin; Zhang, Xiaohua; Chen, Cao; Zhang, Xiaoming

doi:10.1002/maco.201709882

Cited by 16 publications

(4 citation statements)

References 32 publications

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“…The UR12-PR sample exhibited low susceptibility to pitting corrosion and IGC (Figure 6f). Furthermore, bright particles, confirmed as Fe-rich intermetallic particles in our previous study, were observed in Figure 6a-g [31]. As shown in the inset of Figure 6g, the high strains introduced by 12-pass USRP led to the formation of a lamellar structure or ribbon grains in the surface layer.…”

Section: Immersion Testsupporting

confidence: 69%

Effects of Ultrasonic Surface Rolling on the Localized Corrosion Behavior of 7B50-T7751 Aluminum Alloy

Liu

Zhang

et al. 2020

Materials

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The effects of an ultrasonic surface rolling process (USRP) on the localized corrosion behavior of 7B50-T7751 aluminum alloy in a sodium chloride + hydrogen peroxide solution were investigated through microstructural observation, immersion testing, and electrochemical measurements. The results revealed that this alloy is prone to pitting. However, the localized corrosion resistance can be significantly improved via both one-pass USRP and 12-pass USRP treatment. Furthermore, in the test solution, the thickness and the acceptor density of the passivation film were affected by the USRP treatment. The improved corrosion resistance of one-pass USRP-treated samples resulted mainly from the introduced compressive residual stress. However, this stress played a secondary role in the considerable enhancement observed for the corrosion resistance of the 12-pass USRP-treated samples. This enhancement is attributed primarily to the nanocrystalline surface and homogeneous surface microstructure induced by the multiple-pass USRP treatment.

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Section: Immersion Testsupporting

confidence: 69%

Effects of Ultrasonic Surface Rolling on the Localized Corrosion Behavior of 7B50-T7751 Aluminum Alloy

Liu

Zhang

et al. 2020

Materials

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“…In of Al-1 anode was significantly larger than that of Al-2 and Al-3 anodes, and increased with time, i.e., C dl = 1.49 → 3.22 × 10 −4 F cm −2 , indicating that the activation process of Al-1 anode was more intense. However, when the experiment time increased to 20th day, the capacitance (Q-Y 0 ) of Al-2 and Al-3 anodes remained at a lower level than that of Al-1 anode, while the surface resistance (R p ) and charge-transfer resistance (R ct ) was larger, indicating that the corrosion products on the surface of Al-2 and Al-3 anodes were relatively dense [30], which hindered the activation process of Al anodes. Moreover, Furthermore, when the experimental time was 30 days, the capacitance (Q-Y 0 ) and double-layer capacitance (C dl ) of Al-1 anode were both larger, while the surface resistance (R p ) and charge-transfer resistance (R ct ) were smaller, indicating that Al-1 anode can be continuously activated in tidal environment.…”

Section: Polarization Curvementioning

confidence: 95%

Investigation on electrochemicl behavior of modified Al anodes in tidal environment of shengli oilfield

Yang

Wang²,

Wang³

et al. 2023

Mater. Res. Express

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Al anode was widely used for cathodic protection of metal in marine environment due to its high capacitance and current efficiency. However, it was prone to passivation in alternating wet-dry environments. At present, relevant scholars had carried out research on new Al anodes in the alternating dry-wet environment of atmosphere or ocean. However, there were few reports on new Al anodes in the soil alternating dry-wet environment. Therefore, focusing on the tidal environment of Shengli Oilfield, the performance of three types of modified Al anodes was determined by corrosion and electrochemical test. The results showed that compared with Al-2 and Al-3 anodes, the corrosion product layer on the surface of Al-1 anode showed a broken, loose, poor compactness characteristic, while the general corrosion rate (4.329 mm/a) was larger and the maximum pit depth (27 μm) was smaller. Meanwhile, the open-circuit potential of Al-1 anode (EOCP = -1.09 V) was more negative, and the corrosion current density (Icorr = 5.34×10-3 μA/m2) was larger, while the capacitance (Q-Y0 and Cdl) was larger and the resistance (Rp and Rct) was smaller. In conclusion, the Al-1 anode showed a better performance in tidal environment of Shengli oilfield.

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“…Table 1 provides the chemical compositions (in weight percent). The yield strength, ultimate tensile strength, and elongation of the alloy in the rolling direction are 531.5 MPa, 574.1 MPa, and 10.95% respectively [31].…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Influence of surface coverage on the fatigue behavior of a shot peened AA7B50-T7751 alloy

Li¹,

Xue²,

Sun³

et al. 2021

Surf. Topogr.: Metrol. Prop.

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Shot peening treatments with coverages of 100%, 300%, 600%, and 1000% were performed to investigate the effects of shot peening coverage on the fatigue behavior of a 7B75-T7751 alloy. Microhardness and residual stress were measured along with the depth from the treated surface to investigate the mechanical properties. The grain refinement obtained with each shot peening condition was characterized and analyzed by using scanning electron microscopy (SEM) observations and x-ray diffraction (XRD) measurements. Fatigue tests of samples shot peening with different coverages were carried out under maximum stress of 225 MPa and 242 MPa respectively, with a stress ratio (R) of 0.06 to evaluate fatigue life. The results indicated that the increase of coverage will not lead to any significant improvement of the residual stress level when the coverage is more than 300%. Additionally, the surface grain refinement caused by shot peening slows down significantly when the coverage increases to 600%. Therefore, the fatigue life can increase with the increase of shot peening coverage, however, when the coverage exceeds 300%, fatigue life significantly drops because of the micro-cracks generated on the surface. It is concluded that the coverage of 300% seems to be the most optimal condition in terms of fatigue life improvement among the different investigated coverages.

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Effects of pre‐corrosion on mechanical properties of 7B50‐T7751 aluminum alloy in sodium chloride solution

Cited by 16 publications

References 32 publications

Effects of Ultrasonic Surface Rolling on the Localized Corrosion Behavior of 7B50-T7751 Aluminum Alloy

Effects of Ultrasonic Surface Rolling on the Localized Corrosion Behavior of 7B50-T7751 Aluminum Alloy

Investigation on electrochemicl behavior of modified Al anodes in tidal environment of shengli oilfield

Influence of surface coverage on the fatigue behavior of a shot peened AA7B50-T7751 alloy

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