Improved corrosion resistance of mild steel with poly (vinyl pyrrolidone) incorporated zinc phosphate coating

IF 6.3 3区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2025-09-02 DOI:10.1016/j.jtice.2025.106363

S. Ayesha Barsana , P. Magesan , K. Jayamoorthy , M.J. Umapathy

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Abstract

Background

Exploring new additives for coatings to protect surfaces is always a topic of interest. This study explores the enhancement of corrosion resistance in mild steel by applying poly(vinyl pyrrolidone) (PVP) incorporated zinc phosphate coating.

Methods

The corrosion resistance of the coatings was assessed in both neutral (3.5 % NaCl) and acidic (0.5 M HCl) aqueous environments using electrochemical impedance and potentiodynamic polarization techniques.

Significant findings

A thorough analysis of the newly formed coatings revealed that the PVP had reduced the phosphate crystallite size from 32.9 nm of conventional zinc phosphate coating to 21.7 nm and resulted more compact coatings with increased crystal density and reduced cracks. Besides, the added PVP reduced the dissolved iron content and the hydrophilicity of the coating. The corrosion rate calculated from potentiodynamic polarization curves revealed that the addition PVP to the phosphating bath lowered the corrosion rate more than six times compared to the coating formulated without PVP in a neutral environment. The salt spray test showed that the PVP enhanced the coating’s corrosion resistance, highlighting its potential for preventing corrosion in mild steel used in this environment.

Abstract Image

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聚乙烯基吡咯烷酮磷酸锌涂层提高低碳钢的耐蚀性

探索用于涂层表面保护的新添加剂一直是人们感兴趣的话题。本研究探讨了聚乙烯醇吡咯烷酮（PVP）含锌磷酸锌涂层对低碳钢耐腐蚀性的增强作用。方法采用电化学阻抗法和动电位极化法测定了涂层在中性（3.5% NaCl）和酸性（0.5 M HCl）水溶液环境中的耐蚀性。对新涂层的深入分析表明，PVP将磷酸锌涂层的磷酸盐晶粒尺寸从传统的32.9 nm减小到21.7 nm，使涂层更加致密，晶体密度增加，裂纹减少。PVP的加入降低了涂层的溶解铁含量，降低了涂层的亲水性。根据动电位极化曲线计算的腐蚀速率表明，在中性环境中，与不添加PVP的涂层相比，在磷化液中添加PVP的涂层的腐蚀速率降低了6倍以上。盐雾试验表明，PVP增强了涂层的耐腐蚀性，突出了其在这种环境下使用的低碳钢中防止腐蚀的潜力。

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.