Electrical measurements in the study of immersed paint coatings on metal. I. Comparison between capacitance and gravimetric methods of estimating water‐uptake

Wiley - Tập 4 Số 2 - Trang 62-72 - 1954
D. M. Brasher1, A.H. Kingsbury1
1Department of Scientific and Industrial Research, Chemical Research Laboratory, Teddington, Middlesex

Tóm tắt

AbstractAn electrical capacitance method of estimating the water‐uptake of paint films on metal immersed in sea‐water has given, for many paint formulations, values agreeing with those obtained by a gravimetric method. For a few paints, however, pronounced disagreement was shown between values obtained by the two methods.Theoretical considerations show that such differences indicate, in general, a type of water distribution within the film departing considerably from the random, uniform distribution assumed in calculating the ‘capacitance’ values. Several types of distribution are discussed.The capacitance method can be used for routine testing of the water‐uptake of paints only on a type of paint known to give good agreement between the two methods; where applicable, it has decided advantages over gravimetric methods.

Từ khóa


Tài liệu tham khảo

Wormwell F., 1950, J. Iron St. Inst., 164, 141

10.1002/jctb.5000561113

Fancutt F., 1946, J. Iron St. Inst., 144, 273p

First Report of Technical Panel N/P2 of Protective Coatings Sub‐Committee.British Iron and Steel Research Association 1950; also later unpublished work

Wormwell F., 1949, J. Iron St. Inst., 162, 129

Ledwith R. J., 1946, J. Oil Col. Chem. Ass., 29, 67

Thông tin
Thông tin xuất bản

Wiley

Tập 4 Số 2

62-72

Thông tin tác giả