Application of Electrochemical Noise Analysis for Rapid Assessment of Corrosion Resistance in Anodized AlSi Alloys

This study presents a rapid and fully quantitative method for evaluating the corrosion resistance of anodized Aluminum-Silicon (AlSi) alloys through Electrochemical Noise Measurement (ENM). Laboratory specimens and brake components of EN AC-45300 (AlSi5CuMg) are anodized and characterized using both ENM and Neutral Salt Spray (NSS) testing to establish a correlation between the two methodologies. The results reveal a clear and consistent relationship between the logarithm of the noise resistance (Log(R_n)) and the NSS exposure time, demonstrating that ENM captures the key electrochemical features governing corrosion initiation. By providing an objective and data-driven assessment based on measurements acquired within approximately 40 hours, ENM offers a significantly faster and more quantitative approach for predicting NSS performance, thereby reducing validation times of anodized AlSi components.