藤壶附着对低合金高强度钢牺牲阳极保护效果的影响  

Effect of Barnacle Adhesion on Cathodic Protection of Low Alloy High Strength Steel by Sacrificial Anode

作　　者：蔡凡帆 黄彦良[1,2,4] 邢少华 许勇[1,2,3,4] 王秀通 CAI Fan-fan;HUANG Yan-liang;XING Shao-hua;XU Yong;WANG Xiu-tong(Key Laboratory of Marine Environmental Corrosion and Bio-fouling,Institute of Oceanology,Chinese Academy of Science,Shandong Qingdao 266071,China;Open Studio for Marine Corrosion and Protection,Qingdao National Laboratory for Marine Science and Technology,Shandong Qingdao 266237,China;University of Chinese Academy of Sciences,Beijing 100049,China;Center for Ocean Mega-Science,Chinese Academy of Sciences,Shandong Qingdao,266071 China;CSSC Luoyang Ship Material Research Institute,Shandong Qingdao 266237,China)

机构地区：[1]中国科学院海洋研究所海洋环境腐蚀与生物污损重点实验室,山东青岛266071 [2]青岛海洋科学与技术国家实验室海洋腐蚀与防护开放工作室,山东青岛266237 [3]中国科学院大学,北京100049 [4]中国科学院海洋大科学研究中心,山东青岛266071 [5]中国船舶重工集团公司第七二五研究所,山东青岛266237

出　　处：《表面技术》2023年第8期226-236,共11页Surface Technology

基　　金：国家自然科学基金(41976033)。

摘　　要：目的探索藤壶附着对低合金高强度钢阴极保护效果的影响,研究海洋中大型污损生物附着下金属材料的腐蚀规律。方法在青岛胶州湾进行腐蚀挂板实海暴露实验,运用纱网箱隔离藤壶幼虫作为对照组。在暴露6个月和12个月后回收腐蚀挂板,研究藤壶附着后挂板腐蚀形貌、腐蚀产物和阴极保护效率的变化。在室内进行模拟实验,研究牺牲阳极对存在藤壶附着的钢的保护效果。结果在施加牺牲阳极保护后,藤壶附着下的钢表面具有更明显的局部腐蚀坑,且多位于藤壶附着的边缘位置。藤壶附着对牺牲阳极保护效率的影响有限,藤壶附着钢的极化电位相较于无藤壶附着钢的极化电位更负,保护电流密度更小。藤壶附着钢的未附着区域的保护电流密度(63.9μA/cm^(2))比无藤壶附着钢(46.3μA/cm^(2))的保护电流密度高。XRD谱、拉曼光谱和SEM图表明,藤壶附着不影响腐蚀产物或沉积物的组成。结论在牺牲阳极保护下,处于藤壶附着边缘和中心位置的钢,可作为氧浓差电池的阳极,在自催化的协同作用下,腐蚀过程加速,形成了严重的局部腐蚀。同时,藤壶附着可使钢的有效工作面积下降,导致藤壶附着下钢试样的无藤壶附着区域与不存在藤壶附着的钢试样相比,具有更高的保护电流密度和更负的极化电位。In order to study the effect of barnacle adhesion on the cathodic protection of low alloy high strength steel with sacrificial anode,comparative experiments were set up in the field site.The low alloy high strength steel used in this study was AISI 4135 steel and the sacrificial anode used in this study was 99.9%pure zinc.The steel was machined into corrosion coupons with two specifications of 350 mm×250 mm×4 mm and 60 mm×15 mm×4 mm respectively.Part of the small corrosion coupons were placed in a cage with plankton-filter of porosity 74μm to prevent barnacle larva from contacting the surface of the corrosion coupons.Based on past long-term observational experiences,adhered barnacles were fairly abundant at the mid-tide level.Accordingly,the corrosion coupons were fixed at the mid-tide level.After being exposed for 6 and 12 months,the corrosion coupons were analyzed by advanced test techniques,such as X-ray diffraction,Raman spectra,confocal laser scanning microscope and electrochemical tests.Meanwhile,simulating experiments were conducted.The protection current and polarization potential of the low-alloy steel with barnacle adhesion under the protection of sacrificial anodes were monitored.After the experiments,the steel surface deposits were analyzed by scanning electron microscope(SEM)and energy dispersive spectrum(EDS).In the corrosion morphology analysis,the barnacle adhesion area was selected as the observation site of the corrosion coupons with barnacle adhesion,and the observation site of the corrosion coupons without barnacle adhesion was randomly selected.The corrosion morphology results demonstrated that localized corrosion pits formed on the steel substrate regardless of the presence or absence of barnacle adhesion.Meanwhile,it could be found that the steel with barnacle adhesion had larger localized corrosion pits,and tended to form at the edges of the barnacle adhesion.Near-circular raised corrosion morphology was formed in the barnacle adhesion area,while local corrosion pits similar to crevic

关 键 词：藤壶 低合金高强度钢 牺牲阳极 局部腐蚀 保护效率 遮蔽作用 

分 类 号：TG174.41[金属学及工艺—金属表面处理]