The change of pH under a paint film due to cathodic protection

P.J. Gellings, H.C. Ekama

Research output: Contribution to journalArticleAcademic

5 Citations (Scopus)
47 Downloads (Pure)

Abstract

The diffusion of OH−-ions and H2 formed during cathodic protection through a paint film is studied. The diffusion equation is solved for non-stationary conditions and from this the steady state is also derived. It is shown that under usual operating conditions of cathodic protection of ships the stationary state is reached in about 15 days. The danger of paint deterioration through high alkalinity and blistering is found to increase with current density and paint film thickness and with decreasing diffusion coefficient in the paint. For practical calculations a better knowledge of diffusion coefficients in paints is needed.
Original languageUndefined
Pages (from-to)529-535
JournalCorrosion science
Volume15
Issue number6-12
DOIs
Publication statusPublished - 1975

Keywords

  • IR-68332

Cite this

Gellings, P.J. ; Ekama, H.C. / The change of pH under a paint film due to cathodic protection. In: Corrosion science. 1975 ; Vol. 15, No. 6-12. pp. 529-535.
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The change of pH under a paint film due to cathodic protection. / Gellings, P.J.; Ekama, H.C.

In: Corrosion science, Vol. 15, No. 6-12, 1975, p. 529-535.

Research output: Contribution to journalArticleAcademic

TY - JOUR

T1 - The change of pH under a paint film due to cathodic protection

AU - Gellings, P.J.

AU - Ekama, H.C.

PY - 1975

Y1 - 1975

N2 - The diffusion of OH−-ions and H2 formed during cathodic protection through a paint film is studied. The diffusion equation is solved for non-stationary conditions and from this the steady state is also derived. It is shown that under usual operating conditions of cathodic protection of ships the stationary state is reached in about 15 days. The danger of paint deterioration through high alkalinity and blistering is found to increase with current density and paint film thickness and with decreasing diffusion coefficient in the paint. For practical calculations a better knowledge of diffusion coefficients in paints is needed.

AB - The diffusion of OH−-ions and H2 formed during cathodic protection through a paint film is studied. The diffusion equation is solved for non-stationary conditions and from this the steady state is also derived. It is shown that under usual operating conditions of cathodic protection of ships the stationary state is reached in about 15 days. The danger of paint deterioration through high alkalinity and blistering is found to increase with current density and paint film thickness and with decreasing diffusion coefficient in the paint. For practical calculations a better knowledge of diffusion coefficients in paints is needed.

KW - IR-68332

U2 - 10.1016/0010-938X(75)90018-9

DO - 10.1016/0010-938X(75)90018-9

M3 - Article

VL - 15

SP - 529

EP - 535

JO - Corrosion science

JF - Corrosion science

SN - 0010-938X

IS - 6-12

ER -