TY - GEN
T1 - The use of ion exchange compounds as corrosion inhibiting and sensing pigments in organic coatings
AU - Chrisanti, S.
AU - Mahajanam, S.
AU - Buchheit, R. G.
PY - 2004
Y1 - 2004
N2 - In this paper, selected results illustrating the utility of ion exchange compounds as corrosion inhibiting pigments in organic coatings are presented. Ce-exchanged bentonites released Ce 3+, a cathodic inhibitor, while decavanadate-bearing hydrotalcites released vanadates, anodic and cathodic inhibitors, and Zn 2+, also a cathodic inhibitor. Bentonite and hydrotalicte compounds were added to neat epoxy resins and applied to aluminum alloy 2024-T3 substrates separately to make rudimentary protective coatings. Strontium chromate pigmented coatings were tested for comparison. Results from exposure and electrochemical testing showed that corrosion resistance due to inhibitors leached from the pigments was conferred. Based on pigment type, corrosion resistance decreased in the order SrCrO 4 > hydrotalcite > bentonite. Changes in the crystal structure that occurred upon inhbitor release were characterized by x-ray diffraction of the coatings. The changes in the diffraction patterns were regular and suggested a means of sensing inhibitor exhaustion, which leads to an indication of when the coating rehabilitation might be needed.
AB - In this paper, selected results illustrating the utility of ion exchange compounds as corrosion inhibiting pigments in organic coatings are presented. Ce-exchanged bentonites released Ce 3+, a cathodic inhibitor, while decavanadate-bearing hydrotalcites released vanadates, anodic and cathodic inhibitors, and Zn 2+, also a cathodic inhibitor. Bentonite and hydrotalicte compounds were added to neat epoxy resins and applied to aluminum alloy 2024-T3 substrates separately to make rudimentary protective coatings. Strontium chromate pigmented coatings were tested for comparison. Results from exposure and electrochemical testing showed that corrosion resistance due to inhibitors leached from the pigments was conferred. Based on pigment type, corrosion resistance decreased in the order SrCrO 4 > hydrotalcite > bentonite. Changes in the crystal structure that occurred upon inhbitor release were characterized by x-ray diffraction of the coatings. The changes in the diffraction patterns were regular and suggested a means of sensing inhibitor exhaustion, which leads to an indication of when the coating rehabilitation might be needed.
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M3 - Conference contribution
AN - SCOPUS:20444494463
SN - 0871708191
SN - 9780871708199
T3 - Surface Engineering - Proceedings of the 3rd International Surface Engineering Conference
SP - 1
EP - 7
BT - Surface Engineering - Proceedings of the 3rd International Surface Engineering Congress
A2 - Dahotre, N.B.
A2 - Popoola, O.O.
T2 - Surface Engineering - Proceedings of the 3rd International Surface Engineering Congress
Y2 - 2 August 2004 through 4 August 2004
ER -