Corrosivity of soluble sodium silicate aqueous solution to metals

doi:10.16085/j.issn.1000-6613.2020-1420

Abstract

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:

X937

Baoyi WU, Aolin LIU, Jinmei ZHANG, Yuncai LI. Corrosivity of soluble sodium silicate aqueous solution to metals[J]. Chemical Industry and Engineering Progress, 2020, 39(S2): 78-82.

吴保意, 刘奥林, 张金梅, 李运才. 可溶性硅酸钠盐水溶液对金属腐蚀性分析[J]. 化工进展, 2020, 39(S2): 78-82.

Figures/Tables 6

References 16

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序号	名称	模数（n）	pH[0.1% （质量分数）]	pH[1% （质量分数）]	pH（饱和溶液）
1	硅酸钠	3	10.96	12.63	13.35
2	硅酸钠	2	11.15	12.53	13.42
3	偏硅酸钠	1	11.91	13.03	13.57
4	五水偏硅酸钠	1	11.27	12.70	13.48
5	九水偏硅酸钠	1	10.86	12.59	13.47

序号	名称	模数（n）	pH[0.1% （质量分数）]	pH[1% （质量分数）]	pH（饱和溶液）
1	硅酸钠	3	10.96	12.63	13.35
2	硅酸钠	2	11.15	12.53	13.42
3	偏硅酸钠	1	11.91	13.03	13.57
4	五水偏硅酸钠	1	11.27	12.70	13.48
5	九水偏硅酸钠	1	10.86	12.59	13.47

序号	名称	模数（n）	最大腐蚀速率/%	最大腐蚀速率对应质量分数/%
1	硅酸钠	3	11.52	13.63
2	硅酸钠	2	23.47	11.75
3	无水偏硅酸钠	1	57.83	10.03
4	五水偏硅酸钠	1	32.29	10.40
5	九水偏硅酸钠	1	29.62	10.30

序号	名称	模数（n）	最大腐蚀速率/%	最大腐蚀速率对应质量分数/%
1	硅酸钠	3	11.52	13.63
2	硅酸钠	2	23.47	11.75
3	无水偏硅酸钠	1	57.83	10.03
4	五水偏硅酸钠	1	32.29	10.40
5	九水偏硅酸钠	1	29.62	10.30

序号	名称	模数（n）	GHS分类（金属腐蚀物）	GHS分类（皮肤腐蚀物）	TDG分类（腐蚀性）
1	硅酸钠	3	非金属腐蚀物	类别2	非腐蚀性物质
2	硅酸钠	2	类别1（C≥4.3%）	类别1（C≥5%）	UN3266（C≥4.3%）
3	无水偏硅酸钠	1	类别1（C≥1.5%）	类别1（C≥5%）	UN3266（C≥1.5%）
4	五水偏硅酸钠	1	类别1（C≥2.4%）	类别1（C≥5%）	UN3266（C≥2.4%）
5	九水偏硅酸钠	1	类别1（C≥3.0%）	类别1（C≥5%）	UN3266（C≥3.0%）