Evaluation of the corrosion protection of organic-coated zinc-alloy galvanised steels using novel, environmentally-friendly corrosion inhibitor pigments

IF 7.3 2区材料科学 Q1 CHEMISTRY, APPLIED

Progress in Organic Coatings Pub Date : 2025-09-05 DOI:10.1016/j.porgcoat.2025.109646

Gwynfor Callaghan , Sonny Ngo , Geraint Williams

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Abstract

The corrosion behaviour of steel coated with either: a primarily zinc coating comprised of 0.15 wt% Al (HDG) or a zinc-aluminium-magnesium coating, 1.6 wt% Mg, 1.6 wt% Al, and 96.8 wt% Zn (ZAM) are investigated in the presence of industry standard and emerging, environmentally-friendly corrosion inhibitor technologies. With this paper evaluating the inhibitory performance of a functionalised oxy-amino-phosphate-salt of magnesium (OPMG), a hydrotalcite carbonate clay loaded with 4-aminobenzoic acid (HT-PABA), a calcium ion exchange pigment (Ca-Ex), and an inhibitor based on 2-(1,3-benzothiazol-2-ylithio) succinic acid (BTSA) dispersed in model poly-vinyl-butyral (PVB) coatings and 3.5 wt% NaCl (aq) solutions. With their inhibitory performance evaluated against two corrosion-driven coating failure mechanisms: cathodic disbondment (CD), and filiform corrosion (FFC) as a function of inhibitor loading. In the case of CD, an inhibitor ranking order of BTSA > HT-PABA > OPMG > Ca-Ex is observed, while OPMG and HT-PABA are the most effective at slowing rates of FFC. Potentiodynamic and scanning vibrating electrode (SVET) experiments were conducted to evaluate the efficiency of the most promising inhibitors at slowing rates of corrosion on the bare ZAM alloy surface and the exposed cut edges immersed in chloride solutions. With OPMG and BTSA both shown to act as net anodic inhibitors, resulting in an increase in the polarisation resistance by over an order of magnitude. Both inhibitors produced a derived 67 % reduction in total (zinc) metal loss at the exposed ZAM cut-edges over a 24 h immersion period against the control.

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新型环保型缓蚀剂对有机镀锌钢的防腐性能评价

在工业标准和新兴的环保缓蚀剂技术的存在下，研究了涂有0.15 wt% Al （HDG）的主要锌涂层或涂有1.6 wt% Mg、1.6 wt% Al和96.8% Zn （ZAM）的锌-铝-镁涂层的钢的腐蚀行为。本文评价了功能化氧氨基磷酸盐（OPMG）、载4-氨基苯甲酸（HT-PABA）、钙离子交换颜料（Ca-Ex）和分散在聚乙烯基丁醛（PVB）涂层和3.5 wt% NaCl （aq）溶液中的2-（1,3-苯并噻唑-2-基锂基）琥珀酸（BTSA）抑制剂的碳酸水滑石粘土（OPMG）的抑制性能。通过对两种腐蚀驱动涂层失效机制的抑制性能评估：阴极剥离（CD）和丝状腐蚀（FFC）作为缓蚀剂载荷的函数。在CD的情况下，可以观察到BTSA >； HT-PABA > OPMG >； Ca-Ex抑制剂的排名顺序，而OPMG和HT-PABA对FFC的减缓速率最有效。通过电位动力学和扫描振动电极（SVET）实验，评估了最有希望的抑制剂在ZAM合金裸表面和暴露的切割边缘浸在氯化物溶液中的缓蚀效率。OPMG和BTSA都显示出作为净阳极抑制剂的作用，导致极化电阻增加超过一个数量级。与对照组相比，这两种抑制剂在24小时的浸泡时间内，在暴露的ZAM切割边缘处的总（锌）金属损失量减少了67%。

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.