Local galvanic corrosion analysis on cast Mg-Ca binary alloy using scanning Kelvin probe force microscopy

Kondoh, Katsuyoshi; Takei, Rei; Kariya, Shota; Li, Shufeng; Umeda, Junko

doi:10.1016/j.matlet.2022.132266

Cited by 7 publications

(2 citation statements)

References 11 publications

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“…Therefore, it is essential to investigate the effect of corrosion current density when designing SACP. Although many studies on SACP have focused on the corrosion potential [26][27][28][29][30], there is a lack of research on corrosion current density. Thus, in this study, we aim to enhance the lifespan of heat exchangers by considering both corrosion potential and corrosion current density, which will be based on the Butler-Volmer equation and mixed potential theory [31].…”

Section: Introductionmentioning

confidence: 99%

Effect of Zinc Addition in Filler Metal on Sacrificial Anode Cathodic Protection of Fin-Tube Aluminum Heat Exchanger

So,

Park,

Kim

2023

J. Electrochem. Sci. Technol

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<p>This study investigated the tri-metallic galvanic coupling of different metals in the tubes, fillers, and fins of a heat exchanger. The goal was to prevent corrosion of the tubes using the fin as a sacrificial anode while ensuring that the filler metal has a more noble potential than the fin, to avoid detachment. The metals were arranged in descending order of corrosion potential, with the noblest potential assigned to the tube, followed by the filler metal and the fin. To address a reduction in protection current of the fin, the filler metal was modified by adding Zn to decrease its corrosion potential. However, increasing the Zn content of filler metal also increases its corrosion current. The study examined three different filler metals, considering their corrosion potential, and kinetics. The results suggest that a filler metal with 1.5 wt.% Zn addition is optimal for providing cathodic protection to the tube while reducing the reaction rate of the sacrificial anode.</p>

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Section: Introductionmentioning

confidence: 99%

Effect of Zinc Addition in Filler Metal on Sacrificial Anode Cathodic Protection of Fin-Tube Aluminum Heat Exchanger

So,

Park,

Kim

2023

J. Electrochem. Sci. Technol

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“…On the one hand, Harandi et al [ 21 ] demonstrated that the increasing Ca content gives rise to more negative open circuit potential and the formation of more amount of cathodic Mg 2 Ca, hence a reduced corrosion resistance of Mg-(0.7, 1, 2, 3, 4 wt%) Ca alloy. On the other hand, Kondoh et al [ 22 ] recently clarified that the intermetallic compounds Mg 2 Ca are anodic relative to the α -Mg matrix, which were evaluated through the surface potential difference between the anodic Mg 2 Ca and its α -Mg matrix detected by scanning Kelvin probe force microscopy. Namely, Mg 2 Ca is the anodic secondary phase found in Mg–Ca alloys and preferentially degrades before the α -Mg matrix.…”

Section: Introductionmentioning

confidence: 99%