摘要
海南联网工程是我国第一个超高压跨海联网工程,其是海南电网和广东电网安全运行的有效保障。为防止海底高压电缆遭受外力破坏,电缆外安装有铸铁套管。研究铸铁在琼州海峡海底沉积物中的腐蚀行为,对海缆的腐蚀预测与防护具有重要的意义。文章以铸铁为研究材料,以琼州海峡海底沉积物为腐蚀介质,通过腐蚀失重测试、腐蚀形貌观察及腐蚀电化学测试等方法,研究了铸铁在琼州海峡海底沉积物中的腐蚀行为。埋入海底沉积物中的铸铁,在早期平均腐蚀失重速率较高,随时间延长腐蚀速率迅速下降,在30天后,平均腐蚀速率稳定在0.023 mm/a。虽然铸铁的均匀腐蚀速率较低,但是铸铁发生严重的局部腐蚀,局部腐蚀将大大降低铸铁套管的力学性能。
The project of power grid connection between main power grid of China Southern Grid （CSG） and Hainan power grid is the first grid connection project across the channel in China which is extra high voltage, long distance, and large capacity. It is significant important to the safety of Hainan power grid and Guangdong power grid. To preserve the High-Voltage （HV） cable, the cast iron casing was installed around the cable. It is interesting that the corrosion behavior of cast iron was studied in the Qiongzhou Strait marine sediments （QSMS） for the prediction and protection of the cable. In this article, the corrosion behavior of cast iron was researched by weight loss, corrosion morphology and corrosion electrochemical in the QSMS. The average corrosion rate of cast iron that was buried in QSMS is higher at the early stages. The corrosion rate of cast iron decreased rapidly and then tend to be a stable value 0.023 mnva. The average corrosion rate of cast iron is low while the local corrosion is more serious. The local corrosion will resulted in the dynamics performance degradation.
出处
《广东化工》
CAS
2016年第5期52-54,共3页
Guangdong Chemical Industry
基金
"中国南方电网有限责任公司超高压输电公司广州局"的支持
关键词
铸铁套管
海底沉积物
腐蚀
高压电缆
cast Iron casing
seafloor sediment
corrosion
HV Cable
