摘要
为解决某油田4 000m深井TP110-3Cr套管外腐蚀问题,研制了一种新型耐高温锌合金牺牲阳极。采用电化学技术对阳极材料进行了极化曲线和电流效率测试。结果表明:在80℃时,阳极极化曲线较平缓,开路电位较负,无高温"逆转"现象,电流效率大于80%,腐蚀均匀,腐蚀产物易脱落。在模拟某油田地层水条件下,评估了新型阳极的高温防腐蚀性能。结果表明:新型锌合金牺牲阳极在125℃以下,可有效保护套管;在130℃时,阳极发生断裂失效,无法继续使用。
To control the external corrosion of TP110-3 Cr casing of a 4 000 mdepth well in an oilfield,a new-type zinc alloy sacrificial anode at elevated temperature was developed.Measurements of polarization curves and current efficiency of the anode show that at 80 ℃,polarization curve was relatively flat,open circuit potential quite negative and no potential reversal phenomenon was observed,the current efficiency reached 80%,its corrosion morphology was uniform and corrosion products easily falled off.In simulated water of the oilfield site,the corrosion protection performance of the new-type sacrificial anode was evaluated at elevated temperature.It can be concluded that the new anode can protect the casing material efficiently below 125℃,while at 130℃cracking phenomenon might appear and the anode can not be used.
出处
《腐蚀与防护》
北大核心
2017年第12期949-952,958,共5页
Corrosion & Protection
关键词
耐高温
锌合金
极化曲线
电流效率
high temperature
zinc alloy
polarization curve
current efficiency
