Influence of Calcium Scaling on Corrosion Behaviorof Steel and Aluminum Alloys
2020
Calcium scaling is a serious problem
encountered in the oil and
gas industry because it is common that brines produced alongside oil
and gas exhibit high concentrations of calcium ions, among others,
which is expensive to remedy. The precipitation of calcium salts on
the internal wall of the pipelines may occur because of the physical
and chemical changes as fluids are produced from downhole to surface
facilities. Although different researchers have address scaling and
corrosion in the oil and gas industry, there are few reports in the
literature relating the corrosion and scaling phenomena simultaneously.
Despite there being indications that scales may produce corrosion
problems, affecting the mechanical integrity of the infrastructure,
there is minimal research in the literature addressing such relations.
Previous studies presented aluminum alloys as excellent and reliable
materials for applications in the petroleum industry, such as drilling
activities. In this work, we evaluate the corrosion behavior of steel
and aluminum alloys under highly scaling environments using supersaturated
brines. Our results show that the presence of calcium carbonate and
calcium sulfate as a scaling environment increases the corrosion rates
for aluminum alloys and carbon steel; however, the same environments
do not affect the corrosion behavior of stainless steel.
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