Design and Application of a Wire Beam Electrode Array for Sensitization Corrosion Evaluation of Heat-Treated Stainless Steel

This paper presents the design and application of a novel wire beam electrode array for high-sensitivity evaluation of sensitization corrosion in heat-treated stainless steel. The electrode consists of 96347H stainless steel and 4T91 steel wires, arranged in a specific configuration for localized electrochemical response visualization and quantification. The electrodes were immersed in a 3.5% NaCl solution for 120 h, with potential and current density measurements taken every 24 h. Experimental results show that the heat treatment of 347H steel significantly influences its corrosion response. The solution-treated samples exhibited the most stable corrosion behavior, followed by the stabilized samples, while untreated samples displayed significant fluctuations in current density and potential, indicating poor passivation film stability and corrosion resistance. At the same time, T91 steel continuously acted as the anode, providing stable reference electrode signals throughout the experiment. This study verifies the applicability and sensitivity of the wire beam electrode for sensitization corrosion research, offering a new approach to monitoring complex localized corrosion behaviors and material service performance evaluation with strong engineering applicability.