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Modelled distribution of the corrosion rate [mm/year] on bolt joint 3 during the rainy period using the polarization curves

Modelled distribution of the corrosion rate [mm/year] on bolt joint 3 during the rainy period using the polarization curves

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Figure 1. Galvanic corrosion under a TEL, w L  
Table 1 . Materials in the bolt joints
Figure 2. Scheme of an electrochemical cell for TEL measurements  
Figure 3. Polarization curves of mild, stainless and galvanized steel...
+1 Figure 4. Bolt joint 3 after exposure, and the modelled distribution of...
A mathematical model of galvanic corrosion under the conditions of a thin electrolyte film
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Full-text available
  • Apr 2016
A mathematical model of galvanic corrosion under the conditions of a thin electrolyte film was used to evaluate atmospheric corrosion. Experimentally determined weight loss values were used to validate the modelled results. The time dependence of the corrosion degradation was included in the model using polarization curves of the corroded materials...
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... is also no significant difference between the resulting weight loss values for galvanic corrosion which would reflect the time dependence of the corrosion degradation. This is documented by the models in Figure 5. ...

Citations

Simulation and Experimental Validation of Bimetallic Corrosion Between Galvanized Bolt and Mild Steel Plate: Effect of the Bolt Configuration
Article
  • Nov 2023
  • J Miner Met Mater Soc
The effect of the bolt configuration (square, hexagonal, and round) and pitch circle diameter on the extent of galvanic corrosion between a galvanized steel M14 bolt and a mild steel plate was studied in neutral buffer solution by numerical simulation, and the results were validated using the ultrasonic method. The galvanic couple potential ECG values obtained in the polarization were in good agreement with those obtained by modeling and simulation. Maximum and minimum metal dissolution was noted at the joint interface and away from the joint in all the bolted joints. The round galvanized M14 steel bolt exhibited a minimum thickness loss of ~ 0.49 mm if the pitch circle diameter was 70 mm. The metal loss values obtained by simulation were in close agreement with the ultrasonic measurements. The simulation model can be used to identify corrosion-prone areas in the bolted joint assembly.
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