文献类型：期刊文献

英文题名：Effect of Heat Treatment on Microstructure and Corrosion Resistance of Al-Si-Mg-Zr-Cu-Sc Alloy

作者：He, Junyi[1];Liu, Jie[1];Cui, Xiaoli[1];Li, Binbin[2];Tian, Xiaoqing[3];Lu, Chao[1];Wang, Zongshen[1];Gao, Shan[1];Shi, Wenqing[1];Tie, Di[1]

机构：[1]Guangdong Ocean Univ, Sch Mat Sci & Engn, Yangjiang 529500, Peoples R China;[2]Binzhou Bohai Piston Co Ltd, Binzhou 256602, Peoples R China;[3]Binzhou Polytech, Sch Chem & Energy Engn, Binzhou 256602, Peoples R China

年份：2026

卷号：19

期号：7

外文期刊名：MATERIALS

收录：SCI-EXPANDED(收录号：WOS:001738803800001)、、EI(收录号：20261620508958)、WOS

基金：This research was funded by Shandong Provincial Key Research and Development Plan Project (No. 2025CXPT053), Shandong Key Laboratory of Advanced Engine Piston Assembly (No. BH202507), Youth S&T Talent Support Programme of Guangdong Provincial Association for Science and Technology (No. SKXRC2025401), Guangdong Ocean University's research start-up funds (No. YJR24020), Yangjiang City's Key Industry Talent Revitalization Program for Alloy Materials and Hardware Knives & Scissors (No. RCZX2024010) and National Key R&D Program of China (2022YFE0126400).

语种：英文

外文关键词：heat treatment; eutectic Si phase; corrosion resistance; pitting corrosion

外文摘要：Aluminum-silicon (Al-Si) alloys are widely used in aerospace, automotive manufacturing, power electronics, marine engineering and other fields due to their excellent physical properties. However, their corrosion resistance is insufficient in harsh service environments. In this study, a variety of characterization methods were adopted, including scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical measurements (electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization), immersion corrosion tests, and scanning vibrating electrode technique (SVET). The results show that the appropriate heat treatment regime can significantly enhance the corrosion resistance of the alloy, while improper aging parameters will aggravate the corrosion tendency. The optimal heat treatment regime is solution treatment at 500 degrees C for 4 h followed by aging at 200 degrees C for 48 h. Under this condition, the corrosion current density (icorr) is as low as 79.30 mu A/cm2, and the low-frequency impedance modulus and phase angle in EIS tests are optimal. The as-extruded alloy exhibits severe localized corrosion, while the heat-treated alloy transforms into mild and uniform corrosion. The underlying mechanism is that heat treatment induces the formation of uniformly distributed nanoscale Mg2Si and Al3(Sc,Zr) precipitates, which synergistically improve the corrosion resistance of the alloy by weakening micro-galvanic coupling and facilitating the formation of a stable passive film.