普碳钢表面锌防护层在青岛中港海水中耐蚀与防污损性能对比研究

doi:10.11902/1005.4537.2020.248

中国腐蚀与防护学报

2021, Vol. 41

Issue (5): 585-594 DOI: 10.11902/1005.4537.2020.248

研究报告

本期目录 | 过刊浏览

普碳钢表面锌防护层在青岛中港海水中耐蚀与防污损性能对比研究

马士德¹, 刘欣²(

), 王在东³, 任亚东², 邰余³, 韩文³, 段继周¹

^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青岛 266071
^2.青岛科技大学材料科学与工程学院青岛 266042
^3.青岛东启机械设备有限公司青岛 266071

Characterization of Seawater Corrosion Interface of Zinc Coated Steel Plate in Zhong-gang Harbor

MA Shide¹, LIU Xin²(

), WANG Zaidong³, REN Yadong², TAI Yu³, HAN Wen³, DUAN Jizhou¹

^1.Key Laboratory of Marine Environmental Corrosion and Biofouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
^2.College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
^3.Qingdao Dongqi Machinery Equipment Co. Ltd. , Qingdao 266071, China

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摘要:

对普碳钢表面热浸锌、冷镀锌和富锌涂层在青岛中港中进行了5年部分浸入腐蚀实验，对比研究了3种锌防护层耐蚀与防生物污损性能。实海腐蚀实验后进行SEM、EDS、XRD和Fourier红外分析可知，富锌板涂层边角开裂，涂层脱落，防护涂层基本失效；冷镀锌和热浸锌板在相同条件下保持着较好的阻隔性能，表面具有耐腐蚀性能的Zn分布均匀，对基底的防护性能较好，其中热浸锌效果更佳。钢板表面污损生物表征与分析结果表明，3种材料的污损过程从微型生物膜到大型污损生物群落的形成无大差别。综合比较钢板腐蚀和污损情况可知，3种锌涂层对基体的防护作用大小排序为：热浸锌＞冷镀锌＞富锌涂层。

关键词 ：锌护层, 海水, 腐蚀界面, 失效

Abstract：

Hot dip galvanized-, cold galvanized- and Zn-rich coating coated-plain carbon steels were exposure in the seawater of Zhong-gang harbor at Qingdao for five years. Then the long-term immersed steels were characterized by means of EDS, XRD and FT-IR, especially in terms of the interface of seawater/steel. It follows that for the steel plate with Zn-rich coating, cracks emerged at edges and conners, and occurrence of coating falling off on the surface could be observed, which indicates that the coating has generally failed; Meanwhile, both the cold-dip galvanized and hot-dip galvanized plates maintain good barrier performance, and the elemental X-ray mapping reveals that there exist Zn of homogeneous distribution on their corroded surface, to which the better protectiveness of the two Zn galvanizing coatings may be ascribed. Among others, the hot-dip galvanizing is the best in corrosion resistance. The results of characterization for fouling organism on the surface of steel plates show that there is no significant difference in the fouling process in the formation of micro biofilm or the large fouling biological community among the three materials. Comprehensive comparison of corrosion and fouling of steel plates show that the corrosion protectiveness of the three coatings may be ranked in the order as follows: hot dip galvanizing＞cold galvanizing＞zinc rich coating.

Key words： zinc coating seawater corrosion interface failure

收稿日期: 2020-11-30

ZTFLH:

TG127

基金资助:国家自然科学基金(59471054)

通讯作者: 刘欣 E-mail: xliu_neu@126.com

Corresponding author: LIU Xin E-mail: xliu_neu@126.com

作者简介: 马士德，男，1938年生，研究员

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引用本文:

马士德, 刘欣, 王在东, 任亚东, 邰余, 韩文, 段继周. 普碳钢表面锌防护层在青岛中港海水中耐蚀与防污损性能对比研究[J]. 中国腐蚀与防护学报, 2021, 41(5): 585-594.
Shide MA, Xin LIU, Zaidong WANG, Yadong REN, Yu TAI, Wen HAN, Jizhou DUAN. Characterization of Seawater Corrosion Interface of Zinc Coated Steel Plate in Zhong-gang Harbor. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 585-594.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.248 或 https://www.jcscp.org/CN/Y2021/V41/I5/585

图1 3种挂板实海浸入5 a后的正反面照片

图2 3种挂板海水全浸区正反面照片

图3 3种挂板干湿交替区的宏观形貌

图4 3种挂板正面、背面及横截面的SEM形貌

图5 冷镀锌板表面腐蚀形貌及EDS分析

图6 冷镀锌板断面腐蚀形貌及EDS分析

图7 富锌板表面腐蚀形貌及EDS分析

图8 富锌板断面腐蚀形貌，EDS分析及表面腐蚀产物EDS分析

图9 3种锌板正反面腐蚀产物的XRD谱

表1 相关红外吸收峰对应的基团

图10 3种不同镀锌板腐蚀产物的FT-IR图谱

图11 试片附着硅藻优势种

图12 显微镜下玻片附着的纤毛虫活体照片

图13 不同年份富锌涂料、冷镀锌和热镀锌月变化图

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