Effect of Electrical Connection on Corrosion Behavior of Q235 Carbon Steel in Cross Zones in Marine Environment
摘 要
通过对腐蚀速率、微观形貌和锈层成分的测试与分析,研究了电连接状态对Q235碳钢在青岛实海环境中跨越全浸区和潮差区腐蚀行为的影响。结果表明:在非电连接状态下,全浸区试样的腐蚀速率低于潮差区,潮差区试样的腐蚀速率随着暴露高度的增加而增大;在电连接状态下,处于最低潮位线下方试样的腐蚀速率出现峰值,而在潮差区,处于中潮位区域试样的腐蚀速率出现最低值;在全浸区上部和整个潮差区试样的腐蚀形貌存在明显差异;在两种状态下潮差区试样表面锈层成分存在明显差异,在电连接状态下存在锈层的影响,随着暴露高度的增加,锈层中Ca和Mg含量逐渐增加。
Abstract
The effect of electrical connection state on the corrosion behavior of Q235 carbon steel across full immersion zone and tidal zone in Qingdao sea environment were studied by measuring and analyzing corrosion rate, microstructure and rust layer composition. The results showed that under non-electric connection state, the corrosion rate of the sample in full immersion zone was lower than that of the sample in tidal zone, and the corrosion rate of the sample in tidal zone increased with the increase of exposure height. Under electrical connection state, the corrosion rate of the sample under the lowest tidal level line reached the peak value, while in tidal zone, the corrosion rate of the sample in middle tidal level area reached the lowest value. The areas with obvious differences in the corrosion morphology of the samples were mainly in the upper part of full immersion zone and whole tidal zone. There were obvious differences in the composition of the rust layer on the surface of the sample in tidal zone under two states. Under electrical connection state, there was the influence of rust layer. With the increase of exposure height, the content of Ca and Mg in the rust layer gradually increased.
中图分类号 TG174 DOI 10.11973/fsyfh-202306001
所属栏目 试验研究
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收稿日期 2021/6/2
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引用该论文: FENG Na,WU Xingwei,ZHONG Tao,YANG Haiyang,DING Guoqing,DONG Caichang. Effect of Electrical Connection on Corrosion Behavior of Q235 Carbon Steel in Cross Zones in Marine Environment[J]. Corrosion & Protection, 2023, 44(6): 1
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【4】戴明安,张朝玉,黄桂桥,等.钢在海水全浸、潮差区的腐蚀数据分析[J].腐蚀科学与防护技术,1995,7(3):249-252.
【5】林志坚,宋文桑.潮差区钢锈层对钢润湿态阴极过程的影响[J].腐蚀与防护,1994,15(4):193-196.
【6】张彭辉,王炜,郭为民,等.海工钢在热带海域长尺试验腐蚀行为研究[J].装备环境工程,2017,14(2):77-80.
【7】齐公台,邱于兵,张华民,等.电偶法研究16 Mn钢在海水中的腐蚀[J].中国海上油气.工程,1997,9(4):12-16,59.
【8】许春生,穆振军,陈翔峰,等.碳钢在厦门海域长尺试验腐蚀规律探讨[J].中国造船,2009,50(A11):353-356.
【9】许立坤.海洋工程的材料失效与防护[M].北京:化学工业出版社,2014.
【10】宋积文,兰志刚,王在峰,等.海洋环境中阴极保护设计与阴极产物膜[J].腐蚀与防护,2010,31(4):265-267.
【11】朱志平,于萍.阴极保护中钙质沉积层的形成与影响[J].化工腐蚀与防护,1995(1):20-23.
【12】KAROUI H,TLILI M M,RIFFAULT B,et al.Influence of clay suspensions on the precipitation of CaCO3 in seawater[J].Crystal Research and Technology,2010,45(3):259-266.
【13】DESLOUIS C, FALARAS P, GIL O,et al.Influence of clay on calcareous deposit in natural and artificial sea water[J].Electrochimica Acta,2006,51(15):3173-3180.
【14】MANTEL K E,HARTT W H,CHEN T Y.Substrate,surface finish,and flow rate influences on calcareous deposit structure[J].Corrosion,1992,48(6):489-500.
【15】LUO J S,LEE R U,CHEN T Y,et al.Formation of calcareous deposits under different modes of cathodic polarization[J].Corrosion,1991,47(3):189-196.
【16】CULBERSON C H. Effect of seawater chemistry on the formation of calcareous deposits [J]. Corrosion, 1983, 39: 61-69.
【17】YAN J F,WHITE R E,GRIFFIN R B.Parametric studies of the formation of calcareous deposits on cathodically protected steel in seawater[J].Journal of the Electrochemical Society,1993,140(5):1275-1280.
【18】NEVILLE A, MORIZOT AP.Calcareous scales formed by cathodic protection-an assessment of characteristics and kinetics[J].Journal of Crystal Growth,2002,243(3/4):490-502.
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