TITLE:
The Use of Sodium Silicate as a Corrosion Inhibitor in a Saline Drilling Fluid: A Nonaggressive Option to the Environment
AUTHORS:
Fernando B. Mainier, Anne A. M. Figueiredo, Alan Eduardo R. de Freitas, André Armando M. de Alencar Junior
KEYWORDS:
Sodium Silicate, Corrosion Inhibitor, Environment, Aerated Saline Fluid, Carbon Steel
JOURNAL NAME:
Journal of Environmental Protection,
Vol.7 No.13,
December
16,
2016
ABSTRACT: The function of a
corrosion inhibitor in drilling mud compositions is the corrosion protection of
the equipment involved in drilling operations. Many compositions involve
environmentally several products such as fatty amines of high molecular weight,
polyoxylated amines, amides, imidazolines, nitrogen heterocyclic products, etc.
The potential advantages of the use of silicates are the effective protection
of carbon steel, especially in aerated saline fluids, low costs and
non-aggressive behavior to environment. Gravimetric and electrochemical tests
were carried out using an aerated solution of 3.5% NaCl and the addition of
sodium silicate (Na2SiO3·9H2O) as a corrosion inhibitor at concentrations of
250 to 2000 mg/L. The efficiencies of the corrosion protection of carbon steel
using silicate concentrations greater than 1250 mg/L were greater than 92%.