镁合金由于密度小、比强度高及优越的可成型性等优点，具有很广阔的应用前景。然而镁合金耐蚀性较差，极大地制约了镁合金的推广使用，也带来了巨大的经济损失。针对镁合金腐蚀严重的问题，本文通过气相合金化技术制备高纯Mg-Zn二元合金，并系统地对热处理、热压工艺对合金显微组织演变、机械性能及在Ringer's液中耐腐蚀行为影响机理进行了探究。

(1) 通过理论计算与实验验证相结合，确定了气相合金化的较佳工艺参数：镁蒸发温度1000 ℃、锌蒸发温度800 ℃、混合室温度600 ℃，在此条件下成功制备出纯度极高、杂质元素Fe、Ni、Cu含量极低的Mg-Zn合金。

(2) 冷凝态合金呈现典型的分层结构，由α-Mg基体与共晶混合物MgZn+Mg₇Zn₃组成，共晶组织呈两种形态；经360 ℃固溶5 h后，Mg₇Zn₃相部分分解为MgZn相，晶粒尺寸增大，Zn在α-Mg中的固溶度提升；而160 ℃，10 h的时效处理促使Zn原子析出，形成弥散分布的Mg₇Zn₃相。对冷凝态合金进行420 ℃，10 MPa热压6小时后，合金组织显著细化，共晶相含量减少，并形成沿压力方向的扁平状组织。

(3) 经电化学测试，固溶处理使合金在Ringer's液中的自腐蚀电位从冷凝态的-1388.6 mV正移至-1154.2 mV，腐蚀电流密度降低至117.39 μA/cm²；而时效处理态试样因Mg₇Zn₃相增多导致微电偶腐蚀加剧，腐蚀电流密度提升至596.00 μA/cm²。热压态合金的耐蚀性呈现温度依赖性，440 ℃热压2 h的腐蚀电流密度较420 ℃处理降低18 %，归因于第二相MgZn₂的弥散分布对腐蚀的抑制作用。

(4) 浸泡实验发现，固溶态合金表面形成致密的CaCO₃/Mg(OH)₂复合腐蚀产物膜，使腐蚀形态从局部点蚀转变为均匀腐蚀；而热压态合金因晶界处残余应力集中，腐蚀沿织构方向扩展。失重率分析进一步证实，固溶处理使合金在72 h内累计腐蚀的质量损失明显降低，显著优于时效处理和热压处理的合金试样。

Magnesium alloy possesses significant potential for various applications due to its low density, high specific strength, and excellent formability. Nevertheless, the inadequate corrosion resistance of magnesium alloys considerably hampers their widespread adoption and utilization, resulting in substantial economic losses. To address the issue of pronounced corrosion in magnesium alloys, high-purity Mg-Zn binary alloys were synthesized using gas phase alloying technology. Furthermore, a systematic investigation was conducted to explore the influence mechanisms of heat treatment and hot pressing processes on the microstructural evolution, mechanical properties, and corrosion resistance behavior of the alloys when immersed in Ringer's solution.

(1) By integrating theoretical calculations with experimental validations, the optimal process parameters for gas-phase alloying were established: the magnesium evaporation temperature of 1000°C, the zinc evaporation temperature of 800°C, and the mixing chamber temperature of 600°C.

(2) The condensed state alloy displays a typical layered architecture, consisting of an α-Mg matrix alongside an eutectic composition of MgZn and Mg₇Zn₃. The eutectic structure manifests in two variations; following a solid solution treatment at 360°C for a duration of 5 hours, the Mg₇Zn₃ phase partially disintegrates into the MgZn phase, which results in an enlargement of grain size and an increase in Zn solubility within α-Mg. Simultaneously, an aging treatment conducted at 160°C for 10 hours facilitates the precipitation of Zn atoms, thereby producing a dispersed distribution of the Mg₇Zn₃ phase. Subsequent thermal pressing of the condensed state alloy at 420°C under a pressure of 10 MPa for 6 hours significantly refines the alloy structure, reduces the amount of the eutectic phase, and leads to the formation of a flattened structure oriented in alignment with the direction of pressure.

(3) Electrochemical tests revealed that the solution treatment elevated the self-corrosion potential of the alloy in Ringer's solution from -1388.6 mV in the condensed state to -1154.2 mV, while simultaneously reducing the corrosion current density to 117.39 μA/cm². Conversely, the samples subjected to aging treatment exhibited heightened localized corrosion, attributed to a greater volume fraction of the Mg₇Zn₃ phase, resulting in an increase in corrosion current density to 596.00 μA/cm². The corrosion resistance of hot-pressed alloys displayed dependence on temperature; specifically, the corrosion current density recorded at 440°C for 2 hours was 18% lower than that measured at 420°C, a phenomenon attributed to the suppressive effect of the dispersed MgZn₂ secondary phase on corrosion.

(4) The immersion experiments demonstrated the formation of dense CaCO₃/Mg(OH)₂ composite corrosion product film on the surface of the solution-treated alloy, leading to transition in the corrosion mode from localized pitting to uniform corrosion. Conversely, the hot-pressed alloy displays corrosion propagation along the texture direction, attributable to the accumulation of residual stresses at the grain boundaries. Additional weight loss analysis substantiated that solution treatment substantially mitigates cumulative mass loss due to corrosion over a period of 72 hours, thereby showing a significant enhancement compared to specimens that underwent aging treatment and hot pressing.

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