Studies on galvanic corrosion of tri-metallic joint of steels in sodium chloride solution

A failure case of P110 steel tubing in CO2 flooding well

“…The corrosion potential (E corr ) of the steel in the simulated underground water is −820 mV (vs SCE). However, the E corr in the simulated well kill fluid [−290 mV (vs SCE)] was significantly higher than that in the simulated groundwater.The obvious potential difference is enough to induce the galvanic corrosion, in another words, the potential difference should be a high driving force (Qiu et al , 2020; Shaik and Thamida, 2019). Meanwhile, the current densities of the P110 steel are also obviously higher in the simulated groundwater, suggesting that the corrosion process in the simulated groundwater will be more intense.…”

Fatigue corrosion behavior of friction‐welded stainless and carbon steel dissimilar joint

“…Considering dissimilar welded joints, the most important corrosive phenomena to consider are galvanic corrosion, also known as bimetallic corrosion, 40 pitting corrosion, 41 and hydrogen embrittlement 42 . Galvanic corrosion is the most common form of corrosion and occurs when at least two metals with different electrochemical nobility are in contact and immersed together in a conductive electrolyte 43 . The more reactive metal will act as an anode, and it will rapidly dissolve into the electrolyte, whereas the more noble metal (i.e., the one with a higher standard electrode potential) will act as a cathode, and corrosion will be inhibited there.…”

“…42 Galvanic corrosion is the most common form of corrosion and occurs when at least two metals with different electrochemical nobility are in contact and immersed together in a conductive electrolyte. 43 The more reactive metal will act as an anode, and it will rapidly dissolve into the electrolyte, whereas the more noble metal (i.e., the one with a higher standard electrode potential) will act as a cathode, and corrosion will be inhibited there. The greater the difference between the electrode potential of the two materials, the faster the corrosive attack of the anodic metal will be.…”