Chemical Industry and Engineering Progress ›› 2020, Vol. 39 ›› Issue (S2): 78-82.DOI: 10.16085/j.issn.1000-6613.2020-1420

• Chemical processes and equipment • Previous Articles     Next Articles

Corrosivity of soluble sodium silicate aqueous solution to metals

Baoyi WU1,2(), Aolin LIU1,2, Jinmei ZHANG1,2, Yuncai LI1,2   

  1. 1.National Registration Center for Chemicals, MEM, Qingdao 266071, Shandong, China
    2.State Key Laboratory of Chemicals Safety, Qingdao Safety Engineering Institute, SINOPEC, Qingdao 266071, Shandong, China
  • Received:2020-07-22 Online:2020-11-17 Published:2020-11-20
  • Contact: Baoyi WU

可溶性硅酸钠盐水溶液对金属腐蚀性分析

吴保意1,2(), 刘奥林1,2, 张金梅1,2, 李运才1,2   

  1. 1.应急管理部化学品登记中心,山东 青岛,266071
    2.中国石化青岛安全工程研究院,化学品安全控制国家重点实验室,山东 青岛,266071
  • 通讯作者: 吴保意
  • 作者简介:吴保意(1985—),男,工程师,研究方向为化学品鉴定与分类。E-mail:wubaoyi0521@163.com

Abstract:

In order to study the corrosion characteristics of soluble sodium silicate solution to metals, steel sheets and aluminum sheets were used as samples, and the corrosion rate of one week was tested by metal corrosivity tester. The corrosion of three different modulus sodium silicates on steel and aluminium specimens in five different concentrations was investigated. The results show that the soluble sodium silicate solution has no corrosiveness to steel and strong corrosivity to aluminium, and the corrosivity to aluminium is oxygen absorption corrosion. The corrosion starts from the gas-liquid interface, and then spreads to the surrounding area, and the phenomenon of uniform corrosion followed by pitting corrosion appears. When the modulus of sodium silicate is greater than or equal to 3, the aqueous solution is less corrosive to aluminium and does not reach the range of metal corrosives. When the modulus is less than or equal to 2, the corrosion rate of aluminium in aqueous solution is faster. When the mass fraction reaches a certain range, it can be classified as metal corrosives. At the same time, the mass fraction range of metal corrosives is given, which can provide an important reference for daily production, storage, use, supervision and transportation.

Key words: sodium silicate, corrosion, metal corrosives, safety, classification

摘要:

为研究可溶性硅酸钠盐水溶液对金属的腐蚀特性,用钢片和铝片作为测试试样,用金属腐蚀性测试仪对其一周腐蚀速率进行了分析。分别考察了3种不同模数的硅酸钠盐在5种不同浓度时对钢片试样和铝片试样的腐蚀情况。结果表明,可溶性硅酸钠盐水溶液对钢不具有腐蚀性,对铝产生较强的腐蚀性,且对铝的腐蚀性为吸氧腐蚀,腐蚀从气液界面开始,然后向周围蔓延,出现先均匀腐蚀后点蚀的现象。硅酸钠模数大于等于3时,其水溶液对铝的腐蚀性较小,未达到金属腐蚀物的范围。模数小于等于2时,其水溶液对铝的腐蚀速率较快,当质量分数达到一定范围,即可划入金属腐蚀物。同时给出了划入金属腐蚀物的质量分数范围,为日常生产、储存、使用、监管和运输提供了重要的参考。

关键词: 硅酸钠盐, 腐蚀, 金属腐蚀物, 安全, 分类

CLC Number: 

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