Mathematical modeling of the formation of calcareous deposits on cathodically protected steel in seawater

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2056150· OSTI ID:6543388

Yan, J F; Nguyen, T V; White, R E ^[1]; Griffin, R B ^[2]

---

1. Univ. of South Carolina, Columbia (United States)
2. Texas A and M Univ., College Station (United States)

A first principle mathematical model of the formation of calcareous deposits on a cathodically protected steel rotating disk electrode in seawater is presented. The model includes equations which transport phenomena, electrochemical reactions, precipitation reactions, and a homogeneous reaction involved in the formation of calcareous deposits on an electrode surface. Predicted concentration profiles show that a high concentration of OH[sup [minus]] ions on the electrode surface leads to the formation of calcareous deposits. The calcareous deposits contain mostly CaCO[sub 3], but the initial deposits are predicted to contain more Mg(OH)[sub 2] than CaCO[sub 3]. The predicted calcareous deposits on the electrode surface reduce the active surface area available for the electrochemical reactions, which results in a decrease in the cathodic current density. The predicted current density as a function of time during the formation of deposits agrees qualitatively with experimental data.

• OSTI ID: 6543388
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 140:3; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
42 ENGINEERING
423000 -- Engineering-- Marine Engineering-- (1980-)
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CATHODIC PROTECTION
CORROSION PROTECTION
CURRENT DENSITY
DEPOSITION
DEPOSITS
EQUATIONS
HYDROGEN COMPOUNDS
HYDROXIDES
IRON ALLOYS
IRON BASE ALLOYS
KINETIC EQUATIONS
MAGNESIUM COMPOUNDS
MAGNESIUM HYDROXIDES
MATHEMATICAL MODELS
OXYGEN COMPOUNDS
SEAWATER
STEELS
SURFACE AREA
SURFACE PROPERTIES
WATER