Crevice corrosion behavior and mechanism of laser additive manufacturing nickel-based alloy under wedge-shaped crevice by using wire beam electrode

Yao, Xi; Wang, Qinying; Wu, Yafei; Zhang, Xingshou; Dong, Lijun; Bai, Shu‐Lin; Yang, Yi

doi:10.1108/acmm-06-2023-2833

Cited by 2 publications

(1 citation statement)

References 26 publications

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“…This mechanism can successfully explain crevice corrosion under the convective mixing of crevice solution with bulk. Also, the crevice geometry has been found to play a contrasting role depending on the involved metal-electrolyte system [2,6]. Figure 1 shows a schematic illustration of these two mechanisms.…”

Section: Introductionmentioning

confidence: 99%

A Study of Crevice Corrosion Susceptibility of Zn-Al Alloys in a High-pH Environment

Abdulsalam

2023

Metals

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This paper aims to clarify the effect of polymer coating damage of dual polymer–zinc coating used to protect rebar reinforcement from corrosion. The coating damage can result in crevices between the two materials. At these crevices, corrosion–passivation plays an important role in the integrity of the intended coating and the protectiveness of the steel base metal. An experimental design was developed to replicate a crevice of Zn-2%Al alloy. This alloy is commonly used for the dual coating protection of rebars. Experiments in this investigation were performed to test several crevice sizes and conditions to assess the state of crevice corrosion. Prepared electrodes were submerged in a 1 M NaOH solution and connected to a data logger to monitor the potential. A special reference electrode was prepared using activated titanium, against which the potential was measured. Additionally, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization were carried out to assess the corrosion rate of the different specimens. The results suggest that, in the absence of a crevice, corrosion occurred on bare specimens. However, whenever a crevice was present, a shift in potential and corrosion rate values indicated that the specimen shifted from an active corrosion regime to a passive one. This shift (gain) in potential was measured as approximately 0.9 V, resulting in a shift in the electrode potential to −0.6 V (SCE). The analysis showed that the solution inside the crevice shifted toward lower pH values, with pH = 12 suggested as the level that supports more passivity inside the crevice according to the Pourbaix diagram.

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Section: Introductionmentioning

confidence: 99%

A Study of Crevice Corrosion Susceptibility of Zn-Al Alloys in a High-pH Environment

Abdulsalam

2023

Metals

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Investigation into the Mitigation of Crevice Corrosion of Aluminum–Copper Contacts in Seawater by Regulating the Contact Surface Roughness

Chen,

Yin,

Wang

et al. 2024

Adv Eng Mater

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Crevice corrosion for dissimilar metal contacts is a key problem in engineering applications. This work has attempted to prevent the ingress of corrosive media into the crevice between aluminum alloy and copper by controlling the roughness (machining accuracy) of the contact surfaces. Both electrochemical and alternating dry/wet immersion tests were used to investigate the corrosion resistance of aluminum alloy–copper contacts with different contact surface roughness. Considering the relationship between the contact surface roughness and the liquid–solid contact angle and the crevice width, a finite element model based on fluid dynamics theory is established to analyze the effect of the contact surface roughness on the seawater infiltration depth in the contact crevice. The distribution of corrosion products on the aluminum alloy and copper surfaces is observed by optical microscope and scanning electron microscope. The phase composition of the corrosion products is analyzed by X‐ray diffraction technique. The results show that the corrosion resistance of the contact improves as the roughness of the contact surface decreases. This is attributed to the fact that the infiltration of seawater is retarded due to the decrease in the crevice width and increase in the contact angle with the decrease in the contact surface roughness.

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Crevice corrosion behavior and mechanism of laser additive manufacturing nickel-based alloy under wedge-shaped crevice by using wire beam electrode

Cited by 2 publications

References 26 publications

A Study of Crevice Corrosion Susceptibility of Zn-Al Alloys in a High-pH Environment

A Study of Crevice Corrosion Susceptibility of Zn-Al Alloys in a High-pH Environment

Investigation into the Mitigation of Crevice Corrosion of Aluminum–Copper Contacts in Seawater by Regulating the Contact Surface Roughness

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