Corrosion Behavior of Carbon Steels in CCTS Environment

Abstract

The paper reports the results of an experimental work on the effect of steel microstructures on morphology and protectiveness of the corrosion scale formed in water saturated by supercritical CO2. Two HSLA steels were tested. The microstructures were modified by means of different heat treatments. Weight loss was measured after exposure at CO2partial pressure of 80 bar and 60°C temperature. The morphology of the scale was analyzed by means of scanning electron microscope (SEM) energy-dispersive X-ray spectroscopy (EDX). Cathodic potentiodynamic tests were carried out on precorroded specimens for evaluating the effect of preformed scales on cathodic polarization curves in CO2saturated sulphuric acid solution at pH 3, which is the value estimated for water saturated by supercritical CO2. The results are discussed in order to evaluate the effect of iron carbide network on scale growth and corrosion rate. Weight loss tests evidenced average corrosion rate values in the range 1–2.5 mm/y after 150-hour exposure. The presence of thick siderite scale significantly reduces the corrosion rate of carbon steel. A slight decrease of the corrosion rate was observed as the scale thickness increases and moving from martensite to microstructures containing carbides.

Ekstrak Daun Kaliandra Sebagai Inhibitor Alami Laju Korosi St-37

“…Kondisi korosif logam memang sering dipengaruhi oleh peristiwa kimiawi yang terjadi di lingkungan [1][2][3]. Permukaan logam bereaksi terhadap suhu, udara, dan gesekan udara sehingga terjadi perubahan pada kondisi fisik logam.…”

Probabilistic failure assessment of oil pipelines due to internal corrosion

“…Corrosion scales consist of hard mineral coatings, and corrosion deposits build up over time at the location of corrosion, providing a protection layer and reducing the corrosion rate. 50 Since most empirical models assume constant corrosion rates, deceleration of the corrosion rate can be taken into account through the value of α. In other words, α < 1 denotes a corrosion depth advancing with a decreasing pace (slowing corrosion rate), whereas α = 1 denotes a corrosion depth increasing with a constant rate (constant corrosion rate).…”

“…Corrosion scales consist of hard mineral coatings, and corrosion deposits build up over time at the location of corrosion, providing a protection layer and reducing the corrosion rate 50 . Since most empirical models assume constant corrosion rates, deceleration of the corrosion rate can be taken into account through the value of α.…”

Untitled

“…Corrosion is the destruction or damage of material due to reaction with its environment [1][2][3][4]. In order to increase the quality of these products, various efforts have been made, one of which is the electroplating method for metal products.…”