Scanning Kelvin Probe Studies of Filiform Corrosion on Automotive Aluminum Alloy AA6016

2007 ◽  
Vol 154 (7) ◽  
pp. C339 ◽  
Author(s):  
H. N. McMurray ◽  
A. J. Coleman ◽  
G. Williams ◽  
A. Afseth ◽  
G. M. Scamans
Keyword(s):  
Aluminum Alloy ◽  
Kelvin Probe ◽  
Scanning Kelvin Probe ◽  
Filiform Corrosion

Inhibition of Filiform Corrosion on Organic-Coated Aluminum Alloy by Hydrotalcite-Like Anion-Exchange Pigments

CORROSION ◽  
2004 ◽  
Vol 60 (3) ◽  
pp. 219-228 ◽  
Author(s):  
H. N. McMurray ◽  
G. Williams
Keyword(s):  
Aluminum Alloy ◽  
Anion Exchange ◽  
Polyvinyl Butyral ◽  
Kelvin Probe ◽  
Free Corrosion Potential ◽  
Filiform Corrosion ◽  
Coating Delamination ◽  
Coating Defect ◽  
Aluminum Alloy 2024

Abstract Novel anion-exchange anticorrosion pigments consisting of nitrate-, carbonate-, and chromate-exchanged hydrotalcite (HT) are shown to inhibit the propagation of filiform corrosion (FFC) effectively on organic-coated aluminum alloy 2024-T3 (AA2024-T3 [UNS A92024]) alloy. The HT-pigments are dispersed in polyvinyl butyral (PVB) coatings applied to the AA2024-T3 surface. Following FFC initiation by application of controlled amounts of aqueous hydrochloric acid (HCl) to a penetrative coating defect, the time-dependent extent of coating delamination is determined both optically and by repeated in-situ scanning using a scanning Kelvin probe (SKP) apparatus. All the HT-pigments profoundly reduce rates of coating delamination by comparison to unpigmented samples. However, inhibitor efficiency is dependent upon the exchangeable anion and increases in the order: carbonate < nitrate < chromate. It is also shown that by using SKP potentiometry, exchangeable chromate anions interact specifically with the metal surface to depress free corrosion potential values.

Scanning Kelvin Probe Study of (Oxyhydr)oxide Surface of Aluminum Alloy

2012 ◽  
Vol 116 (2) ◽  
pp. 1805-1811 ◽  
Author(s):  
Ö. Özkanat ◽  
B. Salgin ◽  
M. Rohwerder ◽  
J. M. C. Mol ◽  
J. H. W. de Wit ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Oxide Surface ◽  
Kelvin Probe ◽  
Scanning Kelvin Probe

Scanning Kelvin Probe Studies of Cosmetic (Filiform) Corrosion on AA6016

2006 ◽  
pp. 679-686
Author(s):  
H.N. McMurray ◽  
A.J. Coleman ◽  
G. Williams ◽  
Andreas Afseth ◽  
G.M. Scamans
Keyword(s):  
Kelvin Probe ◽  
Scanning Kelvin Probe ◽  
Filiform Corrosion

Correction to “Scanning Kelvin Probe Study of (Oxyhydr)oxide Surface of Aluminum Alloy”

2012 ◽  
Vol 116 (10) ◽  
pp. 6505-6505 ◽  
Author(s):  
Ö. Özkanat ◽  
B. Salgin ◽  
M. Rohwerder ◽  
J. M. C. Mol ◽  
J. H. W. de Wit ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Oxide Surface ◽  
Kelvin Probe ◽  
Scanning Kelvin Probe
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