By admin whcp
Corrosion is defined as the deterioration of a material, usually a metal, because of a reaction with its environment and which requires the presence of an anode, a cathode, an electrolyte, and an electrical current. Corrosion can be mitigated by five basic methods: coatings, cathodic protection, materials selection, chemical inhibitors, and environmental change. It is important that the engineer understands the causes and forms of corrosion, as well as the available protections, to ensure that the most cost effective corrosion mitigation method is
Control of corrosion depends upon maintaining a separation between susceptible alloys and the corrosive environment. This separation is accomplished in various ways. A good intact coat of paint provides most of the corrosion protection on naval aircraft. Sealants used at seams and joints prevent entry of moisture into the metal, preservatives are used
Corrosion is seen as one of the biggest problems for the assets in the Oil and Gas industry. Most of the leaking and malfunctions in machines are caused by corrosion. Certain machines and lines have under bad oil conditions a lifetime of only 2 years, sometimes even less and this is causes exorbitant costs.
The Oil and Gas industry like exploration offshore / onshore make it more protection to as long installation pipe distribution production begin source in wellhead area through manifold production platform. Additional chemical inhibitor inside pipe flowline is preventive step to protection installation piping and make it good condition lifetime.
Corrosion inhibitor used in the oil field can be grouped into several common types or mechanistic classes: passivating, vapor phase, cathodic, anodic, film forming, neutralizing, and reactive. The common material of construction in oil and gas production is carbon or low-alloy steel, so the primary aim is steel inhibition. Inorganic inhibitors, such as sodium arsenite (Na2HAsO3) and sodium ferrocyanide, were used in early days to inhibit carbon dioxide (CO2) corrosion in oil wells
Inhibitors also allowed the injection and production of high volumes of corrosive water resulting from the secondary-recovery concept of waterflooding. At first, it was thought that organic compounds inhibit corrosion by adsorbing at the metal-solution interface. Three types of adsorption could be possible with organic inhibitors: p- bond orbital adsorption, electrostatic adsorption, and chemisorption. A more simplistic view of this mechanism of corrosion inhibitors can be described as controlled precipitation of the inhibitor from its environment (water and hydrocarbons) onto metal surfaces. A more recent view of the mechanism of oil/gas field corrosion inhibitors invokes the incorporation of the inhibitor into a thin corrosion-product film. Over the years, many improvements in inhibitor technology have been made in formulation and methods of applying inhibitors.