CAJ | 학술논문

针对海洋环境条件下铝合金点蚀比较严重问题，提出了基于空心阴极效应的离子氧化技术制备耐蚀保护层技术.在低频双极脉冲放电装置中进行铝合金氧化改性处理，温度控制在450~550℃范围内，氧化时间为3 h.采用扫描电子显微镜（SEM）和 X 射线光电子能谱（XPS）等测试手段对氧化层进行分析表征，实验表明可在铝合金表面制备20~500 nm 厚的致密光滑的氧化层（Al2 O3）.在3.5% NaCl 溶液中对未处理和离子氧化样品进行浸泡腐蚀实验，经过浸泡20 d 后，未处理样品受到严重腐蚀，而氧化样品表面无明显腐蚀现象.由此可见空心阴极放电辅助离子氧化技术可以显著提高铝合金的耐点蚀性能.
침대해양배경조건하려합금점식비교엄중문제，제출료기우공심음겁효응적리자양화기술제비내식보호층기술.재저빈쌍겁맥충방전장치중진행려합금양화개성처리，온도공제재450~550℃범위내，양화시간위3 h.채용소묘전자현미경（SEM）화 X 사선광전자능보（XPS）등측시수단대양화층진행분석표정，실험표명가재려합금표면제비20~500 nm 후적치밀광활적양화층（Al2 O3）.재3.5% NaCl 용액중대미처리화리자양화양품진행침포부식실험，경과침포20 d 후，미처리양품수도엄중부식，이양화양품표면무명현부식현상.유차가견공심음겁방전보조리자양화기술가이현저제고려합금적내점식성능.
Aluminium alloy is susceptible to pit corrosion in the saline water environment. It is presented that plas-ma oxidation with hollow cathode effect may be used to produce thicker oxide layer which can improve corrosion re-sistance. Plasma oxidizing is carried out by using a low-frequency pulse excited plasma unit. The aluminum alloy samples are oxidized at 450 - 550 ℃ for 3 h. The modified layer is characterized by X-ray photoelectron spectrosco-py and scanning electron microscopy. The results show that oxide layers of 20 - 500 nm thick is formed on the sur-face of aluminium alloy. Immersion experiments are carried out to test the effect of oxidation on the corrosion resist-ance of the samples. After immersion in 3. 5% NaCl solution for 20 d,severe corrosion occurrs on the untreated surface while no evident corrosion is observed for the oxidized sample. Plasma oxidation with hollow cathode dis-charge can improve the pitting corrosion resistance of the aluminium alloy.