Impact of Hybrid Nanocoatings on the Corrosion Behavior of 6063 Aluminum Alloy
YUAN Hao1, CHEN Yuqiang1,2,*, RAN Guanglin1, SHU Qiting3, WEN Zhihao1, LU Dingding1,*, HUANG Liang4, YE Juncai4
1 School of Mechanical and Electrical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China; 2 Southwest Aluminium (Group) Co., Ltd., Chongqing 401326, China; 3 Xiangtan Municipal Ecological Environment Bureau, Xiangxiang Branch, Xiangxiang 411100, Hunan, China; 4 Zhuzhou Times Metal Manufacturing Co., Ltd., Zhuzhou 412200, Hunan, China
Abstract: To address the pitting and intergranular corrosion issues of 6063 aluminum alloy in NaCl service environments, an organic-inorganic hybrid nanocoating strategy was employed to enhance its corrosion resistance. Within the corrosion testing period of 0.5—144 h, the organically modified silicon-based coating (U-Sil 120) and the titanium-based coating (ET-110-7035) exhibited markedly improved corrosion resistance compared with conventional anodic oxidation. Their average corrosion potentials shifted to -0.62 V and -0.65 V, while the average charge transfer resistance increased to 3.98×106 Ω·cm2 and 2.2×106 Ω·cm2, respectively. After 168 h neutral salt spray testing, only localized micro-area delamination was observed on the hybrid-coated samples, whereas the anodized samples showed pronounced corrosive cracking. Accelerated corrosion tests after 48 h further revealed that the depth of intergranular corrosion was reduced by 27% and 23% for U-Sil 120 and ET-110-7035 samples, respectively, compared to anodized samples. The superior performance of the hybrid coatings can be attributed to their robust barrier effect, which effectively suppresses Cl- ingress and retards the kinetic of electrochemical reactions. In addition, the U-Sil 120 exhibited strong interfacial bonding strength with the substrate, allowing corrosive media to penetrate only through microcracks and initiate relatively mild superficial corrosion.
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2026, Vol. 40 
