A Zn–Al composite coating was successfully deposited on Q235 steel by cold spray technology for the corrosion protection in the marine atmosphere. The microstructure and corrosion behavior of the prepared coating was studied byScanning Electron Microscope (SEM), X-ray Diffraction (XRD), salt spray test and electrochemical experiments. A 2400-h neutral salt spray corrosion test (with a corrosion medium of 3.5% sodium chloride solution) showed that the prepared cold-sprayed Zn-Al composite coating has excellent anti-corrosion properties. Based on the microstructure evolution and corrosion products analysis, droplets’ flow-driven ‘synergistic corrosion effect’ was proposed to explain the co-corrosion behavior of Zn and Al particles in the composite coating.

中文翻译：

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Zn-Al冷喷涂复合涂层的组织与腐蚀行为

通过冷喷涂技术成功地在Q235钢上沉积了Zn-Al复合涂层，以保护海洋环境。通过扫描电子显微镜（SEM），X射线衍射（XRD），盐雾试验和电化学实验研究了制备的涂层的微观结构和腐蚀行为。2400小时的中性盐雾腐蚀试验（使用3.5％氯化钠溶液的腐蚀介质）表明，所制备的冷喷涂Zn-Al复合涂层具有出色的防腐性能。在微观组织演变和腐蚀产物分析的基础上，提出了液滴流动驱动的“协同腐蚀效应”，以解释复合涂层中锌和铝颗粒的共腐蚀行为。