期刊
CORROSION SCIENCE
卷 136, 期 -, 页码 304-310出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2018.03.014
关键词
Graphene nano-platelets; Scanning Kelvin probe; Cathodic delamination; Iron; Zinc
资金
- EPSRC
- Welsh Government
- Tata Steel UK
- Innovate UK [EP/I019278/1, EP/ K000292/1, EP/L010372/1]
- EPSRC [EP/K000292/1, EP/L010372/1, EP/I019278/1] Funding Source: UKRI
In-situ Scanning Kelvin probe (SKP) measurements are used to follow the corrosion-driven cathodic delamination kinetics of model coatings comprising graphene nano-platelets (GNP) dispersed in polyvinylbutyral (PVB) adherent to iron and zinc (galvanised steel). To reduce delamination rates by > 90% (relative to unpigmented PVB) a GNP volume fraction of 0.056 is required on iron but only 0.028 on zinc. On this basis, together with work function and 02 permeability data it is proposed that the GNP acts principally to slow through-coating oxygen transport on iron; whereas on zinc a galvanic couple forms between zinc and GNP, displacing cathodic oxygen reduction.
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