塑性变形加工对纯锌在天津土壤浸出液中腐蚀行为的影响

doi:10.11902/1005.4537.2023.108

中国腐蚀与防护学报

2024, Vol. 44

Issue (2): 497-504 CSTR: 32134.14.1005.4537.2023.108 DOI: 10.11902/1005.4537.2023.108

研究报告

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塑性变形加工对纯锌在天津土壤浸出液中腐蚀行为的影响

李文杰¹, 车晓钰¹, 唐永存¹, 刘光明²(

), 田文明³, 何华林⁴, 刘晨辉²

^1.国网天津市电力公司天津 300010
^2.南昌航空大学材料科学与工程学院南昌 330063
^3.北华航天工业学院材料工程学院廊坊 065000
^4.成都诺嘉伟业科技有限公司成都 611330

Effect of Plastic Deformation Processing on Corrosion Behavior of Pure Zinc in a Leaching Solution of Soil at Tianjin

LI Wenjie¹, CHE Xiaoyu¹, TANG Yongcun¹, LIU Guangming²(

), TIAN Wenming³, HE Hualin⁴, LIU Chenhui²

^1.State Grid Tianjin Electric Power Company, Tianjin 300010, China
^2.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
^3.School of Materials Engineering, North China Institute of Aerospace Engineering, Langfang 065000, China
^4.Chengdu Great Norga Science and Technology Co., Ltd., Chengdu 611330, China

引用本文:

李文杰, 车晓钰, 唐永存, 刘光明, 田文明, 何华林, 刘晨辉. 塑性变形加工对纯锌在天津土壤浸出液中腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2024, 44(2): 497-504.
Wenjie LI, Xiaoyu CHE, Yongcun TANG, Guangming LIU, Wenming TIAN, Hualin HE, Chenhui LIU. Effect of Plastic Deformation Processing on Corrosion Behavior of Pure Zinc in a Leaching Solution of Soil at Tianjin[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 497-504.

全文: PDF(15815 KB) HTML

摘要:

由热挤压获得了不同变形加工量的工业纯锌棒材，通过电化学测试、浸泡加速腐蚀实验及金相表征研究了变形加工量对纯锌微观组织及腐蚀特性的影响。结果表明：铸造纯锌金相组织较为粗大，粗晶粒内部存在大量细小亚晶粒及铸造孪晶。随塑性变形加工量的增加，纯锌的初级晶粒会显著细化，亚晶粒会融合长大，孪晶显著减少直至消失。在土壤浸出液中纯锌的点蚀电位及钝化区间随变形量的增加而增大，腐蚀电流密度及维钝电流密度则呈减小趋势，塑性变形处理提升了纯锌的钝化膜电阻及腐蚀反应中的电荷转移电阻。纯锌的金相组织均匀性随塑性变形量的增加持续改善，进而显著提升了纯锌在土壤浸出液中的耐蚀能力。

关键词 ：纯锌, 塑性加工, 金相组织, 电化学, 土壤腐蚀

Abstract：

Pure zinc bars with different deformation degree were prepared by hot rolling. The effect of deformation degree on the microstructure and corrosion properties of pure zinc in a leaching solution of soil at Tianjin were studied by electrochemical test, immersion accelerating corrosion test and metallographic characterization. The results showed that the cast pure zinc had a coarse microstructure with a large number of fine sub-grains and casting twins. The primary grains of zinc were obviously refined, while the sub-grains were merged and grown with the increase of plastic deformation degree. The cast twins were significantly reduced as the deformation degree increased. The pitting potential and passivation interval of pure zinc in the soil leaching solution increased with the increase of deformation degree. While the corrosion current density and passivation current density decreased as the deformation degree increased. The resistance of passive film and the charge transfer resistance of corrosion process of zinc obviously increased after plastic deformation treatment. The continuously improved metallographic homogeneity of pure zinc, which resulted from the increased plastic deformation degree could enhance the corrosion resistance of pure zinc in the soil leaching solution.

Key words： pure zinc plastic processing metallographic structure electrochemistry soil corrosion

收稿日期: 2023-04-13 32134.14.1005.4537.2023.108

ZTFLH:

TG172

基金资助:国家自然科学基金(51961028)

通讯作者: 刘光明，E-mail: gemliu@126.com，研究方向为材料的腐蚀与防护

Corresponding author: LIU Guangming, E-mail: gemliu@126.com

作者简介: 李文杰，男，1990年生，硕士，工程师

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图1 不同变形加工量处理后的1#~4#纯锌试样典型金相形貌

图2 不同变形加工量处理后的1#~4#纯锌晶粒/亚晶粒尺寸分布区间

图3 不同变形加工量处理后的1#~4#纯锌OCP测试曲线

图4 不同变形加工量处理后的1#~4#纯锌动电位极化曲线

表1 不同变形加工量处理后的1#~4#纯锌动电位极化曲线Tafel拟合结果

图5 不同变形加工量处理后的1#~4#纯锌EIS测试曲线

图6 拟合EIS图谱的等效电路

表2 EIS拟合的Rhf及Rct值

图7 1#~4#纯锌试样在土壤浸出液中浸泡30 d后的腐蚀形貌

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