流动条件下铁基非晶纳米晶涂层钝化行为研究
Study on Passivation Behavior of Fe-based Amorphous Nanocrystalline Coatings under Flow Conditions
王勇 1王书然 1史安邦 1衣方宇 2王宇航 2李梓依2
作者信息
- 1. 东北石油大学机械科学与工程学院
- 2. 中国石油集团长城钻探工程有限公司
- 折叠
摘要
通过初期腐蚀电流密度监测、电化学阻抗谱、极化曲线和微观形貌分析,研究了静态和动态不同流速下铁基非晶纳米晶涂层的钝化与点蚀行为.结果表明:流动条件下,铁基非晶纳米晶涂层的自腐蚀倾向增加;随着流速的增加,钝化电流密度先增加后减小,流速为5 L/min时,钝化电流密度达到极大值3.09×10-4 A/cm2;点蚀电位先降低后增加,滞后环面积先增加后减小,点蚀坑最大深度达50.61 μm,可见高流速条件下涂层的点蚀能力降低.
Abstract
Through monitoring the density of initial corrosion current,analyzing electrochemical impedance spectrum,polarization curve and micro-morphology,both corrosion tendency and pitting behavior of Fe-based amorphous nanocrystalline coatings at different flow rates were studied to show that,the self-corro-sion tendency of Fe-based amorphous nanocrystal coatings increases under flow conditions.With the in-crease of the flow rate,the passivation current density increases first and then decreases and reaches 3.09×10-4 A/cm2,a maximum value when the flow rate stays at 5 L/min.The pitting potential decreases first and then increases and the hysteresis ring area increases first and then decreases and the maximum depth of pitting pit reaches 50.61 μm.This means that the pitting ability of the coating decreases at high flow rate.
关键词
铁基非晶纳米晶涂层/动态腐蚀/流速/钝化/点蚀Key words
Fe-based amorphous nanocrystalline coatings/dynamic corrosion/flow rate/passivation/pitting corrosion引用本文复制引用
基金项目
国家自然科学基金(51974091)
黑龙江省自然科学基金(LH2023E016)
出版年
2024
NETL
NSTL
万方数据