A method for determining the polarization state of the metal with the middle potential in order to calculate the corrosion rate of multi‐metals complicated galvanic couple

Hu, Qiangfei; Zhang, T.; Geng, Shujiang; Wang, F. H.

doi:10.1002/maco.201609358

Cited by 9 publications

(3 citation statements)

References 44 publications

(80 reference statements)

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“…Therefore, Zn is added to the filler metal [22]. However, increasing the Zn content of the Al alloy also increases the corrosion current density of the filler metal [23,24], which can affect the corrosion behavior of the Al heat exchanger in the tri-metallic galvanic couple [25]. Therefore, it is essential to investigate the effect of corrosion current density when designing SACP.…”

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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“…Thus, the effect of different tri-metal galvanic couplings on the corrosion reliability should be considered for designing Al fin-tube heat exchangers. Generally, in tri-metal galvanic couples that include three metals (A 1 , A 2 , and A 3 ) with different corrosion potentials in the order of E A1 > E A2 > E A3 , the polarization of the middle potential metal (E A2 ) can be defined by the mixed potential theory [25,26]. If the tri-metal galvanic coupled metals (A 1 , A 2 , and A 3 ) comply with the Tafel system (a linear system), the polarization state of the middle potential metal can be determined by the Tafel superposition relation.…”

Section: Sea Water Acetic Acid Test (Swaat)mentioning

confidence: 99%

“…can be defined by the mixed potential theory[25,26]. If the tri-metal galvanic coupled metals (A1, A2,171and A3) comply with the Tafel system (a linear system), the polarization state of the middle potential 172 metal can be determined by the Tafel superposition relation.…”

mentioning

confidence: 99%

Simulation Approach for Cathodic Protection Prediction of Aluminum Fin-Tube Heat Exchanger Using Boundary Element Method

Kim

Park

Kim

2019

Metals

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The multi-galvanic effect of an Al fin-tube heat exchanger was evaluated using polarization tests, numerical simulation, and the seawater acetic acid test (SWAAT). Determination of the polarization state using polarization curves was well correlated with numerical simulations using a high-conductivity electrolyte. However, the polarization results did not match those of the low-conductivity electrolyte due to the lower galvanic effect. Although the polarization state is changed by electrolyte conductivity, the total net current of the tube is decreased in the case of the anodic joint. From SWAAT results, the leakage time of Al fin-tube heat exchanger assembled by anodic joint was longer than the case with cathodic joint.

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Micro‐galvanic corrosion of duplex stainless steel annealed at different temperatures evaluated by experiments and a numerical simulation model

Cao

2022

Materials & Corrosion

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In this study, micro-galvanic corrosion of SAF 2205 duplex stainless steel (DSS) annealed at different temperatures with different phase ratios (α/γ) in a 1 M H 2 SO 4 + 1 M NaCl solution is analyzed by zero resistance ammeter (ZRA), immersion and numerical simulation model. COMSOL Multiphysics is used to solve the numerical simulation model and predict the local current density, potential distribution, and morphology of DSS annealed at different temperatures with different phase ratios. The modeling results are in good agreement with the immersion test results, which indicate that the microgalvanic corrosion depth of SAF 2205 DSS annealed at different temperatures initially decreases and then increases with the increase in the phase ratios (α/γ). The best micro-galvanic corrosion resistance is obtained at an annealing temperature of 1100°C.

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A method for determining the polarization state of the metal with the middle potential in order to calculate the corrosion rate of multi‐metals complicated galvanic couple

Cited by 9 publications

References 44 publications

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

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

Simulation Approach for Cathodic Protection Prediction of Aluminum Fin-Tube Heat Exchanger Using Boundary Element Method

Micro‐galvanic corrosion of duplex stainless steel annealed at different temperatures evaluated by experiments and a numerical simulation model

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