Galvanic Corrosion Behavior of Different Bond Bolts in Q345HN Weathering Steel Tower for Power Transmission and Transformation
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Abstract
The galvanic corrosion behavior of dissimilar lap bolt connections of Q345HN weather-resistant steel towers for power transmission and transformation was studied by salt spray test. The corrosion effects of 304SS and galvanized carbon steel bolts on the base metal of weathering steel were investigated. Combined with numerical simulation methods, the galvanic current field distribution of bolts and base metals of different materials was analyzed. The results showed that the galvanized layer could not effectively protect the weathering steel. Affected by the cathodic current, the anodic oxidation process of the weathering steel was inhibited, and it was difficult to form a dense oxide layer around the bolt. Stainless steel would accelerate the anodic process of weathering steel around the bolt, but under the condition of anodic polarization, the rust layer of weathering steel was loose and has no protective properties.
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