保温材料浸出液成分及腐蚀性分析
Analysis of Components and Corrosivity of Aqueous Extract from Thermal Insulation Materials
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- 引用格式:
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蒋林林,张彦军,张红磊,周冰,韩文礼.保温材料浸出液成分及腐蚀性分析[J].天然气与石油,2018,36(5):0.doi:
Jiang Linlin, Zhang Yanjun, Zhang Honglei, Zhou Bing, Han Wenli.Analysis of Components and Corrosivity of Aqueous Extract from Thermal Insulation Materials[J].Natural Gas and Oil,2018,36(5):0.doi:
- DOI:
- 作者:
- 蒋林林1,2 张彦军1,2 张红磊1,2 周 冰1,2 韩文礼1,2
Jiang Linlin1,2 Zhang Yanjun1,2 Zhang Honglei1,2 Zhou Bing1,2 Han Wenli1,2
- 作者单位:
- 1. 中国石油集团工程技术研究有限公司，2. 中国石油天然气集团公司石油管工程重点实验室—涂层材料与保温结构研究室
1. CNPC Engineering Technology Research Limited Company, Tianjin, 300451, China 2. The Key Laboratory of Tubular Goods Engineering, CNPC—Research Division of Anti-Corrosion Coating and Thermal Insulation Structure
- 关键词:
- 保温材料;浸出液;腐蚀性;分析
Thermal insulation materials; Aqueous extract; Corrosivity; Analysis
- 摘要:
- 保温层进水,会造成层下金属的腐蚀。对玻璃棉、141 b体系聚氨酯泡沫塑料、二氧化硅气凝胶保温毡浸出液和去离子水的pH值、电导率、离子浓度进行了测试,对其腐蚀性进行分析,为保温材料的选用和腐蚀控制提供参考。实验结果表明：玻璃棉浸出液呈弱碱性,电导率是三种材料中最大的,并随着浸泡时间和浸泡温度的增加有增大的趋势,浸出液中含有Ca2+、CO2-3、SO2-4和Cl-,易引起点蚀、外应力腐蚀开裂；141 b体系聚氨酯泡沫浸出液呈弱碱性,pH值随着浸泡时间和浸泡温度的增长有减小的趋势,电导率相对较小,80℃浸出液电导率大于常温浸出液,浸出液中未检出SO2-4、CO2-3；二氧化硅气凝胶保温毡浸出液呈中性,随浸泡时间和温度的增加转变成酸性,电导率随浸泡时间和浸泡温度的变化不大,浸出液中未检出SO2-4、CO2-3。与去离子水中Cl-浓度相比,141 b体系聚氨酯泡沫塑料、二氧化硅气凝胶保温毡浸出液中Cl-浓度接近0 mg/L。
Corrosion under insulation happened when water came into thermal insulation layer.The pH value, conductivity andions contentsof aqueous extracts of glass wool,141b system polyurethane foam and silica aerogel insulation blanketsanddeionized waterwere tested to estimate their corrosivity and provide references for thermal insulation materials selection and corrosion control.The results showed thatthe lixivium of glass wool was alkalescent. Its conductivity was the largest among the three and increased with the soaking duration and temperature rising.It containedCa2+, CO32-, SO42-and Cl-, which easily caused pitting corrosion and external stress corrosion cracking.The lixivium of141b system polyurethane foam wasalkalescent, the pH value of which decreased with the soaking duration and temperature rising. The conductivity was relatively smaller and that of 80℃ lixivium was larger than lixivium under room temperature.SO42-and CO32-weren’t detected in thelixivium.The lixivium ofsilica aerogel insulation blankets was neutral and changed into acid with soaking duration and temperature increasing.The conductivity changed slightly with soaking duration and temperature variation.SO42-and CO32-weren’t detected either.Compared with thedeionized water, theconcentrationofCl-inlixivium of141b system polyurethane foam and silica aerogel insulation blankets was closed to0 mg/L.
