摘要
镁铝合金因其抗腐蚀性强,被广泛应用在船体建造当中,但在实际应用过程中发现,环境温度的高低会影响其抗腐蚀性能。因此为改善船体质量,延长船体使用寿命,研究环境温度对船体耐蚀镁铝合金的腐蚀行为的影响具有重要意义。通过实验方式,以环境温度作为变量,采用金相显微镜、扫描电镜、能谱分析仪和重量法分析镁铝合金在20℃,30℃和40℃下的腐蚀形貌、腐蚀产物和腐蚀速度。结果表明:随着环境温度的升高,镁铝合金试样块的腐蚀形貌呈胞状生长,一定程度后造成腐蚀坑洼现象,以致最后表面出现大量的裂纹;镁铝合金试样块在不同温度下被腐蚀后,会产生由Mg元素和O元素构成的腐蚀产物,且Mg元素与O元素的比例越来越大;随环境温度的升高,镁铝合金试样块的腐蚀速率越来越快。
Magnesium aluminum alloy has been widely used in hull construction because of its corrosion resistance, but it has been found in the actual process that the environmental temperature has reduced its corrosion resistance. Therefore, in order to improve hull quality and prolong the service life of ship, it is very important to study the influence of ambient temperature on corrosion behavior of magnesium alloy. The corrosion morphology, corrosion product and corrosion rate of magnesium aluminum alloy at 20, 30 and 40 °C were analyzed by metallographic microscope, scanning electron microscope, energy spectrum analyzer and gravimetric method. The results show that the corrosion morphology of the magnesium aluminum alloy specimen increases with the environment temperature, the corrosion morphology is cell like growth, and the corrosion potholes are caused to a certain extent, resulting in a large number of cracks on the final surface. After the corrosion of the magnesium aluminum alloy specimen at different temperatures, the corrosion produced by the Mg element and the O element will produce. The ratio of Mg to O is increasing. With the increase of ambient temperature, the corrosion rate of Mg-Al alloy is faster and faster.
出处
《舰船科学技术》
北大核心
2018年第10X期64-66,共3页
Ship Science and Technology
基金
山西省教育厅"1331工程"优势特色学科资助项目(材料科学与工程
2050205高等教育)
关键词
环境温度
镁铝合金
腐蚀行为
影响分析
ambient temperature
Mg-Al alloy
corrosion behavior
influence analysis
