EVALUATION OF CORROSION PROTECTION CAPACITY OF DOPED PPY FILM FOR STAINLESS STEEL IN AN ACIDIC MEDIUM

IF 0.5 Q4 EDUCATION & EDUCATIONAL RESEARCH Rasayan Journal of Chemistry Pub Date : 2023-01-01 DOI:10.31788/rjc.2023.1628208

Monika, G. Rani, Naveen Kumar, R. Ahlawat

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Abstract

Advanced corrosion protection methods include covering stainless steel surfaces with conductive polymer-based coatings. Polypyrrole and polypyrrole composites of tungstate of different concentrations were deposited on stainless steel-304 using cyclic voltammetry and their elemental analysis was verified by EDX analysis. EIS and potentiodynamic polarization analysis show that the corrosion protection efficiency (CPE) of polypyrrole composites is higher than polypyrrole coating. The reduction in corrosion rate due to the inhibitory action of tungstate through the physical barrier and anodic protection mechanism was validated by greater Rct and lower Icorr values of polypyrrole composites. In the composites, with increasing the concentration of tungstate in polypyrrole from 5% to 15%, CPE also increases, as polypyrrole composites are more able to shift the corrosion potential of stainless steels towards the passive zone and form a new nonporous passive oxide film on the surface. With a 15% concentration coating, the highest CPE of 93% and the lowest corrosion rate of 130 mmpy were obtained, indicating that the entire stainless steel active surface area is completely absorbed and that no active sites exit for adsorption at this concentration. The synthesized polypyrrole composites with a 15% concentration offer excellent corrosion protection prospects.

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酸性介质中掺杂ppy膜对不锈钢的防腐性能评价

先进的防腐蚀方法包括用导电聚合物涂层覆盖不锈钢表面。采用循环伏安法在不锈钢304表面沉积了不同浓度的钨酸盐聚吡咯和聚吡咯复合材料，并用EDX分析对其元素分析结果进行了验证。EIS和动电位极化分析表明，聚吡咯复合材料的防腐效率(CPE)高于聚吡咯涂层。聚吡咯复合材料具有较大的Rct和较低的Icorr值，证明了钨酸盐通过物理屏障和阳极保护机制的抑制作用降低了腐蚀速率。在复合材料中，随着聚吡咯中钨酸盐的浓度从5%增加到15%，CPE也随之增加，因为聚吡咯复合材料更能将不锈钢的腐蚀电位向钝化区转移，并在表面形成新的无孔钝化氧化膜。当涂层浓度为15%时，最高的CPE为93%，最低的腐蚀速率为130 mmpy，这表明在该浓度下，不锈钢的整个活性表面积被完全吸收，没有活性位点被吸附。合成的聚吡咯复合材料具有良好的防腐效果，其浓度为15%。

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来源期刊

Rasayan Journal of Chemistry Energy-Energy (all)

CiteScore

1.90

自引率

0.00%

发文量

196

期刊介绍： RASĀYAN Journal of Chemistry [RJC] signifies a confluence of diverse streams of chemistry to stir up the cerebral powers of its contributors and readers. By introducing the journal by this name, we humbly intent to provide an open platform to all researchers, academicians and readers to showcase their ideas and research findings among the people of their own fraternity and to share their vast repository of knowledge and information. The journal seeks to embody the spirit of enquiry and innovation to augment the richness of existing chemistry literature and theories. We also aim towards making this journal an unparalleled reservoir of information and in process aspire to inculcate and expand the research aptitude.