排烟冷却塔防腐涂层对混凝土耐酸腐蚀性影响的试验研究

Experimental Research on Influence of Anticorrosion Coating for Fume Cooling Tower on Acid Corrosion of Concrete

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关键词:

排烟冷却塔;混凝土;防腐涂层;酸腐蚀

Key words:

Fume cooling tower; Concrete; Anticorrosion coating; Acid corrosion

刊期:

2016年第7期

DOI:

文章编号:

1000-4637(2016)07-11-05

基金项目:

国家自然科学基金项目(51178455); 国家“863”计划课题(2012AA06A402)

作者:

阴琪翔1,侯明姣2,杜健民3,刘建秋1,商文念1,李 林1

单位:

1.国家核电山东电力工程咨询院有限公司,济南250013;2.山东正元建设工程有限责任公司,济南250013;3.中国矿业大学力学与建筑工程学院,江苏省土木工程环境灾变与 结构可靠性重点实验室,徐州221116

摘要

摘   要:“烟塔合一”技术的运用使烟气中残留的腐蚀性介质进入冷却塔,塔内环境的腐蚀性大大增强,特别是酸腐蚀环境的发展会直接导致塔壁混凝土的耐久性能降低。在选定混凝土强度等级条件下,开展了不同种类防腐涂料的耐酸腐蚀试验。试验结果表明:防腐涂层的运用可有效阻止酸性介质对混凝土的侵蚀;在相同酸性腐蚀条件下,有机成膜型涂料抗盐酸侵蚀能力要强于无机渗透型涂料;水泥基渗透结晶型涂层在酸性环境下存在表皮脱落现象,在使用中应考虑酸性环境对该涂层稳定性的影响。

Abstract: The use of "smoke tower" technology makes the residues of corrosive medium in flue gas into the cooling tower with flue gas, the corrosion is greatly enhanced in tower, especially the acid corrosion environment will directly lead to the development of the tower wall of concrete durability performance degradation. Under the selected concrete strength grade, the acid corrosion test of different kinds of anticorrosive coatings is carried out. The use of anti-corrosion coating can effectively prevent the corrosion of the concrete from the acid medium. Under the same acid corrosion condition, the corrosion resistance of the organic film coating is better than that of inorganic permeable coating. The surface of the cement-based permeable crystalline coating has the phenomenon of epidermal shedding in the acid environment, which should be considered in the use of the acidic environment to affect the stability of the coating.

结论

(1)和空白无涂料试块相比,混凝土防腐涂层可以有效阻止外界腐蚀介质对混凝土的侵蚀,并在很大程度上改善混凝土在酸性环境下耐久性不足的缺陷,延长排烟冷却塔使用寿命。
(2)混凝土涂刷防腐涂料后对混凝土抗酸性溶液侵蚀的效果非常显著,不同成分防腐涂层防腐效果不同,有机成膜型涂料抗盐酸侵蚀能力要强于无机渗透型涂料,重度防腐AA方案各组涂层试块抗盐酸侵蚀效果都比较好,而轻度防腐A方案中T4组水泥基渗透结晶型抗酸腐蚀效果不好。
(3)烟塔中酸性条件是钢筋混凝土腐蚀的控制因素,通过实验数据说明采用涂层保护是十分有效且必要的。本文采用酸腐蚀作为评价涂层对混凝土作用的指标,论证了涂层在烟塔这种环境中使用的必要性,同时也给电厂选用涂料提供了数据支持。
(4)水泥基渗透结晶型涂层在酸性溶液中浸泡一周后就出现了涂层脱落的现象,所以酸性溶液作用下的混凝土使用水泥基渗透结晶型防腐涂层时需要慎重考虑防腐涂层的稳定性问题。此外,还应综合考虑防腐涂层各方面的性能,如涂层的耐冲刷、耐酸碱性、经济性等,经全面分析比较后才能对涂料做出综合评价。

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