INHIBITION OF CORROSION-DRIVEN COATING DELAMINATION ON ZINC BY POLY ANILINE EMERALDINE SALTS

机译：聚苯胺翡翠盐对锌的腐蚀驱动涂层脱层的抑制作用

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Emeraldine salts of p-toluene sulphonic, camphor sulphonic, phenyl phosphonic and phosphoric acids dispersed in polyvinyl butyral are applied to galvanized steel substrates. Such dispersions are shown to effectively inhibit corrosion-driven delamination when a penetrative defect is exposed to NaCl electrolyte. The influence of increasing pigment volume fractions (φ) of the doped pigments on delamination kinetics and E_(intact) (potential of intact coating areas) is studied using a Scanning Kelvin probe. For over 48h no delamination is observed at relative humidity (RH) of 95% when the φ of each pigment ≤ 0.05 (PAni-PP), ≥ 0.1 (PAni-CSA) and ≥ 0.2 (PAni-PTS.) Ennoblement does not persist beyond 9h at the same RH but a zinc oxide layer proportional to φ_(PAni-ES) develops at the coating-metal interface. It is proposed that this oxide layer participates in stifling O_2 reduction and coatings are protected from alkaline dissolution as a result of the synergism with the pH buffering capacity of PAni-ES.

机译：将分散在聚乙烯醇缩丁醛中的对甲苯磺酸，樟脑磺酸，苯基膦酸和磷酸的翡翠盐施于镀锌钢基材上。当渗透缺陷暴露于NaCl电解质中时，此类分散体可有效抑制腐蚀驱动的分层。使用扫描开尔文探针研究了增加的掺杂颜料的颜料体积分数（φ）对分层动力学和E_（完整）（完整涂层区域的电势）的影响。当每种颜料的φ≤0.05（PAni-PP），≥0.1（PAni-CSA）和≥0.2（PAni-PTS）时，在48h以上的相对湿度（RH）下均未观察到分层。在相同的相对湿度下超过9h，但在涂层-金属界面上形成了与φ_（PAni-ES）成比例的氧化锌层。提出该氧化物层参与窒息的O_2还原，并且由于与PAni-ES的pH缓冲能力的协同作用，保护了涂层免受碱溶解。

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《Proceedings vol.2004-14; Electrochemical Society(ECS) International Meeting and Symposium on Corrosion in Marine and Saltwater Environments II; 20041003-08; Honolulu,HI(US)》|2004年|P.410-420|共11页
会议地点 HonoluluHI(US)
作者
M.J.Loveridge; H.N.McMurray; G.Williams;
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Materials Research Centre, School of Engineering, University of Wales Swansea, Singleton Park, Swansea, U.K. SA2 8PP;

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正文语种 eng
中图分类材料腐蚀与保护;
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INHIBITION OF CORROSION-DRIVEN COATING DELAMINATION ON ZINC BY POLY ANILINE EMERALDINE SALTS

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