Ammar Hany R, Sherif Elsayed M, Sivasankaran Subbarayan, Almufadi Fahad A, Mekky Abdel-Baset H
Department of Mechanical Engineering, College of Engineering, Qassim University, Buraydah 51452, Saudi Arabia.
Center of Excellence for Research in Engineering Materials (CEREM), Deanship of Scientific Research, King Saud University, Riyadh 11421, Saudi Arabia.
Materials (Basel). 2023 Feb 16;16(4):1663. doi: 10.3390/ma16041663.
In this study, corrosion-resistant AA5083-BN/WC composites were developed for tribological applications through adequate control of the reinforcement content (WC and BN) in the matrix (AA5083 alloy). The effects of 6% and 12% tungsten carbide (WC) as well as 6% and 12% boron nitride (BN) additions on the corrosion behavior of AA5083 aluminum composite in 3.5% NaCl solution were carried out. Electrochemical techniques such as cyclic potentiodynamic polarization (CPP), changes in the chronoamperometric current with time (CCT), and electrochemical impedance spectroscopy (EIS) were utilized. The polarization results showed that the addition of 6% WC to the AA5083 alloy matrix improved its resistance to corrosion (R). Rp exhibited an additional increase by adding 12% WC to the matrix. The values of R were observed to increase for the AA5083 composite when adding 6% BN, and the highest R values were recorded for the composite that contains 12% BN. The results obtained by the CPP method were confirmed by CCT and EIS measurements, where the presence of WC and BN protected the developed AA5083- BN/WC composites against corrosion. The corrosion resistance revealed an additional improvement with an increase in WC and BN content from 6% to 12%. The results also confirm that pitting corrosion decreased in the presence of WC and BN in the fabricated composites.
在本研究中，通过适当控制基体（AA5083合金）中增强相（WC和BN）的含量，开发了用于摩擦学应用的耐腐蚀AA5083-BN/WC复合材料。研究了添加6%和12%碳化钨（WC）以及6%和12%氮化硼（BN）对AA5083铝基复合材料在3.5%NaCl溶液中腐蚀行为的影响。采用了循环动电位极化（CPP）、计时电流随时间变化（CCT）和电化学阻抗谱（EIS）等电化学技术。极化结果表明，向AA5083合金基体中添加6%WC可提高其耐腐蚀性（R）。向基体中添加12%WC时，Rp进一步增加。添加6%BN时，AA5083复合材料的R值增加，含12%BN的复合材料R值最高。CCT和EIS测量结果证实了CPP方法获得的结果，即WC和BN的存在保护了所开发的AA5083-BN/WC复合材料免受腐蚀。随着WC和BN含量从6%增加到12%，耐腐蚀性进一步提高。结果还证实，在制备的复合材料中，WC和BN的存在使点蚀减少。
