CORROSION BEHAVIOR OF MILD STEEL IN SODIUM SULFATE SOLUTION IN PRESENCE OF PHOSPHATES OF DIFFERENT COMPOSITION

Q3 Engineering

Journal of Chemical Technology and Metallurgy Pub Date : 2024-01-03 DOI:10.59957/jctm.v59.i2.2024.16

A. Raimbekova, Viktoriya Kapralova, Angelina Popova, Sholpan Kubekova, Amantai Dalbanbay, Aizhan Kalenova, Bekezhan Mustahimov, Sharipa Yermekbayeva, Sharbanu Myrzabekova

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Abstract

Corrosion of mild steel in sodium sulfate solutions (1000 mg SO42- L-1) in the presence of various phosphateinhibitors was studied gravimetrically. Studies were performed under static conditions at room temperature. The known sodium polyphosphate inhibitor has been found to have low efficacy under these conditions. The inhibitor efficiency of its does not exceed 30.5 % at a concentration of 100 mg P2O5 L-1. It has been shown that a more effective inhibitor is calcium-manganese polyphosphate (Са, Mn)(PO3)2 obtained on the basis of manganese ore enrichment wastes of the Zhayrem deposit. The inhibitor efficiency of its already at a concentration of 20 mgP2O5 L-1 is 47.3 %. At a concentration of 100 mgP2O5 L-1, the inhibitor efficiency (Са, Mn)(PO3)2 is 96.2 %. Electrochemical tests confirmed the results of the gravimetric study. Infrared spectroscopic analysis showed that phosphate protective coatings were formed on the steel surface in solutions of sodium sulfate with additives of calcium-manganese polyphosphate.

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低碳钢在不同成分磷酸盐存在的硫酸钠溶液中的腐蚀行为

在硫酸钠溶液（1000 毫克 SO42- L-1）中，在各种磷酸盐抑制剂的作用下，对低碳钢的腐蚀进行了重力测量研究。研究是在室温静态条件下进行的。研究发现，已知的聚磷酸钠抑制剂在这些条件下的功效较低。在 100 mg P2O5 L-1 的浓度下，其抑制效率不超过 30.5%。研究表明，更有效的抑制剂是在 Zhayrem 矿床锰矿富集废料基础上获得的钙锰聚磷酸盐 (Са，Mn)(PO3)2。当浓度为 20 mgP2O5 L-1 时，其抑制效率为 47.3%。当浓度为 100 mgP2O5 L-1 时，其抑制效率 (Са, Mn)(PO3)2 为 96.2 %。电化学测试证实了重量分析的结果。红外光谱分析显示，在含有聚磷酸钙锰添加剂的硫酸钠溶液中，钢铁表面形成了磷酸盐保护层。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Chemical Technology and Metallurgy Engineering-Industrial and Manufacturing Engineering

CiteScore

1.40

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0.00%

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