目的 研究不同Nd含量的铸态Mg-xNd合金（x=1.1%、5.5%、9.9%,质量分数,下同）及高温氧化态Mg-xNd合金在3.5%（质量分数）NaCl溶液中的腐蚀行为与耐蚀性能。方法 利用析氢法和电化学法对比分析合金试样的腐蚀性能。通过X射线衍射仪获取合金试样的相组成。采用扫描电子显微镜观察合金试样腐蚀前后的微观形貌特征。通过激光共聚焦显微镜分析合金试样去腐蚀产物后的腐蚀深度。结果 在铸态和高温氧化处理条件下,随着Nd元素含量的增加,合金试样的腐蚀速率均呈现递增趋势。尤其在高Nd含量铸态合金中,Mg12Nd相和镁基体产生严重的电偶腐蚀,极大程度地降低了合金试样的耐蚀性能。但是,经过高温氧化处理的样品表面形成了致密的Nd2O3/MgO复合保护膜,进一步隔绝了Cl-对镁基体的侵蚀,有效地改善了合金的耐蚀性能,其中以高温氧化态Mg-1.1% Nd合金的耐蚀性能最为优异。结论 合金试样的耐蚀性能是Nd含量、相组成、热处理状态及氧化膜结构共同作用的结果。尽管随着Nd元素含量的增加,合金的腐蚀速率增大,但经过高温氧化处理后,可利用Nd元素形成致密的Nd2O3/MgO复合保护膜,从而在一定程度上抵消其对腐蚀的促进作用,实现耐蚀性能的提升。
Abstract
The work aims to investigate the corrosion behavior and corrosion resistance of as-cast Mg-xNd alloys (x=1.1%, 5.5% and 9.9%) and high-temperature oxidized Mg-xNd alloys in a 3.5 wt.% NaCl solution. The corrosion resistance of alloy samples was compared and analyzed with hydrogen evolution method and electrochemical method. The phase composition of alloy samples was obtained by X-ray diffractometer. The microscopic morphology characteristics of alloy samples before and after corrosion were observed by scanning electron microscopy. The corrosion depth of alloy samples after removal of corrosion products was analyzed by laser confocal microscopy. Under both the as-cast condition and the high-temperature oxidation treatment conditions, the corrosion rate of alloy samples increased with the increasing content of Nd element. Especially in the high-Nd content as-cast alloy, the Mg12Nd phase and the magnesium matrix suffered severe galvanic corrosion, significantly reducing the corrosion resistance of alloy samples. However, the sample surface after high-temperature oxidation formed a dense Nd2O3/MgO composite protective film, which further isolated the chloride ions from eroding the magnesium matrix and effectively improved the corrosion resistance of alloys. Among them, the corrosion resistance of the Mg-1.1% Nd alloy in the high-temperature oxidation state was the most outstanding. The corrosion resistance of alloy samples is the result of the combined effects of Nd element content, phase composition, heat treatment state and oxide film structure. Although the increase in Nd element content leads to an increase in the corrosion rate of alloys, through high-temperature oxidation treatment, a dense Nd2O3/MgO composite protective film can be formed with the Nd element, thereby partially counteracting its promoting effect on corrosion and achieving an improvement in corrosion resistance.
关键词
Mg-Nd合金 /
高温氧化处理 /
显微组织 /
氧化膜 /
腐蚀性能
Key words
Mg-Nd alloy /
high-temperature oxidation treatment /
microstructure /
oxide film /
corrosion resistance
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基金
国家自然科学基金（52204407）; 江苏省自然科学基金（BK20220595）
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