亚热带季风气候下碳钢氟碳聚氨酯-环氧涂层的老化行为
Aging Behavior of Fluorocarbon Polyurethane and Epoxy System Coating for Carbon Steel under Subtropical Monsoon Climate
摘 要
为了研究碳钢氟碳聚氨酯-环氧涂层在亚热带季风气候条件下服役的老化特性，在广州地区对该涂层试样进行了户外暴露试验。通过户外暴露不同时间后涂层电化学阻抗谱和微观形貌分析涂层的老化行为，并结合划叉试样微区表面电位分析涂层在破损后的失效行为。结果表明：在亚热带季风气候下，涂层具有较好的抗老化性能，对基体防护效果较好；经12个月的户外暴露试验后，涂层没有失效，但表面出现了微米级孔洞，涂层的抗渗性能下降；随着户外暴露时间的延长，涂层破损部位的金属基体很快腐蚀，在腐蚀产物的作用下，失效行为向涂层覆盖区域逐渐扩展。
老化行为
户外暴露
表面电位
carbon steel coating
aging behavior
outdoor exposure
surface potential
Abstract
Outdoor exposure tests were carried out on fluorocarbon polyurethane and epoxy coating for carbon steel under subtropical monsoon climate in Guangzhou, in order to study the aging characteristics of the coating. The aging behavior of the coating was analyzed by the electrochemical impedance spectrum and micro morphology of the coating after outdoor exposure for different periods of time. The failure behavior of the coating after damage was analyzed with the surface potentials of the micro-area in cross-cutting sample. The results showed that the coating had a good anti-aging property and protective effect on the substrate under subtropical monsoon climate. After 12 months of outdoor exposure test, the coating did not fail, but there were micron-sized pores in its surface, so the impermeability of the coating decreased. With the increase of outdoor exposure time, the metal substrate in the damaged part of the coating quickly corroded, and the failure behavior gradually expanded to the coated area under the action of corrosion products.
中图分类号 TG174.46 DOI 10.11973/fsyfh-202308007
所属栏目 试验研究
基金项目 国家电网有限公司总部科技项目（5200-202119092A-0-0-00）
收稿日期 2022/5/2
修改稿日期
网络出版日期
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引用该论文: SONG Jialiang,YANG Zhen,LIU Xuan,GAO Jin,XIAO Kui,MO Juan,ZHOU Zhengqiang. Aging Behavior of Fluorocarbon Polyurethane and Epoxy System Coating for Carbon Steel under Subtropical Monsoon Climate[J]. Corrosion & Protection, 2023, 44(8): 35
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【3】杨靖波, 韩军科, 李茂华, 等. 特高压输电线路钢管塔计算模型的选择[J]. 电网技术, 2010, 34(1):1-5.
【4】丁宗保, 黄成云, 薛慧君, 等. 特高压钢管塔重型构件河网地区运输[J]. 电力建设, 2012, 33(6):105-108.
【5】宋卓, 郭军科, 郭锦龙. 环境对电网材料的腐蚀影响分析及评价[J]. 山西电力, 2008(5):7-9.
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【7】LYON S B, BINGHAM R, MILLS D J. Advances in corrosion protection by organic coatings:what we know and what we would like to know[J]. Progress in Organic Coatings, 2017, 102:2-7.
【8】DE-LA-FUENTE D, CHICO B, MORCILLO M. The effects of soluble salts at the metal/paint interface:advances in knowledge[J]. Portugaliae Electrochimica Acta, 2006, 24(2):191-206.
【9】王力伟, 王新华, 卢琳, 等. 有机涂层剥离的微区电化学研究进展[J]. 腐蚀与防护, 2014, 35(2):158-162.
【10】胡吉明, 张鉴清, 谢德明, 等. 水在有机涂层中的传输ⅠFick扩散过程[J]. 中国腐蚀与防护学报, 2002, 22(5):311-315.
【11】VAN DER WEIJDE D H, VAN WESTING E P M, DE WIT J H W. EIS measurements on artificial blisters in organic coatings[J]. Electrochimica Acta, 1996, 41(7/8):1103-1107.
【12】克努森, 福斯格伦. 有机涂料防腐蚀技术[M]. 王向农, 崔志刚, 译.2版. 北京:中国石化出版社, 2021.
【13】刘新. 防腐蚀涂料涂装技术[M]. 北京:化学工业出版社, 2016.
【14】李增权, 李红艳. 氟碳面漆抗老化性能研究[J]. 电镀与精饰, 2021, 43(7):47-51.
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