面向海工结构阴极防护用纳米水泥基热电复合材料制备及其温差自供能性
Preparation of nano-modified cement-based thermoelectric composite and its self-power supply behaviors engineered cathodic protection for offshore structure
袁士柯 1罗健林 2高乙博 1滕飞 1张纪刚 2刘昂 2张立卿3
作者信息
- 1. 青岛理工大学 土木工程学院,青岛 266520
- 2. 青岛理工大学 土木工程学院,青岛 266520;海洋混凝土教育部工程研究中心,青岛 266520
- 3. 华东交通大学 土木工程学院,南昌 330013
- 折叠
摘要
经略海洋及双碳背景下,用阴极防护(CP)技术提升海工结构服役寿命具有重要意义,然而需外加电源额外驱动.为此本文先用水热法合成纳米二氧化锰(nMnO2),然后与碳纳米管(CNTs)复掺水泥砂浆体系中,制备纳米水泥基热电复合材料(NTEC);最后将 20个NTEC串联成 1套热电发电模块,并结合电化学方法综合评价基于温差发电的NTEC热电模块直接用作海工结构钢筋CP系统电流供给源的可行性.结果表明:复掺有 0.2wt%CNTs与 5.0wt%nMnO2 的 NTEC试件的热电系数、热电功率因数可分别达 3 612 μV/℃和301.4 μW·m-1·℃-2,本征力学强度与耐久抗渗性得到保障;施加基于NTEC温差发电的CP,钢筋的腐蚀电位正移,腐蚀概率显著降低;施加基于NTEC热电模块的CP后能使钢筋腐蚀电流密度降低 3个数量级,腐蚀电荷转移得到了抑制,腐蚀速率大为降低,实现海工结构钢筋CP的自供能,同时保障了其用作保护层的强度与耐久性.
Abstract
Under the background of strategic ocean and double-carbon,it is important to use cathodic protection(CP)technology to enhance the service life of offshore structures.However,it requires additional power supply for extra drive.Here,nano-size nMnO2 was synthesized by hydrothermal method,and then was mixed into cement mortar along with carbon nanotubes(CNTs)to prepare nano-modified cement-based thermoelectric composites(NTEC).20 NTECs were connected in series to form a set of thermoelectric power generation module,and com-bined with electrochemical methods to comprehensively evaluate the feasibility of NTEC thermoelectric module based on differential temperature power generation directly serving as a current supply source for the reinforce-ment CP system of offshore structure.Results show that:The thermoelectric coefficient and thermoelectric power factor of NTEC specimens doped with 0.2wt%CNTs and 5.0wt%nMnO2 can be up to 3 612 μV/℃,and 301.4 μW·m-1·℃-2,respectively.The intrinsic mechanical strength and anti-permeability are accordingly guaranteed.Applying the CP based on the temperature difference power generation of NTEC,the corrosion potential of the reinforcement bar positively shifts,and the probability of corrosion is significantly reduced.Applying the CP based on the NTEC thermoelectric module the corrosion current density of the reinforcement is reduced by 3 orders of magnitude,the corrosion charge transfer is suppressed,the corrosion rate is greatly reduced,the self-power supply of CP for reinforcement in offshore structures is realized,and its mechanical properties and durability are guaranteed when simultaneously serving as concrete cover.
关键词
海工结构/阴极防护自供能/纳米水泥基热电复合材料/温差发电性能/电化学性能Key words
offshore structures/self-power supply for cathodic protection/nano-modified cementitious thermo-electric composites/temperature difference power generation performance/electrochemical proper-ties引用本文复制引用
基金项目
国家自然科学基金(51878364)
山东省自然科学基金(ZR2023ME011)
中建八局横向合作项目(JM20191030)
中建八局横向合作项目(B2-2022-0253)
中建八局横向合作项目(B2-2022-0048)
中建八局横向合作项目(B2-2023-0014)
国家111计划省高峰学科项目()
出版年
2024
NETL
NSTL
万方数据