Ad
related to: impressed current cathodic protection method
Search results
Results from the WOW.Com Content Network
Cathodic protection (CP; / k æ ˈ θ ɒ d ɪ k / ⓘ) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. [1] A simple method of protection connects the metal to be protected to a more easily corroded "sacrificial metal" to act as the anode. The sacrificial metal then corrodes ...
A galvanic anode, or sacrificial anode, is the main component of a galvanic cathodic protection system used to protect buried or submerged metal structures from corrosion. They are made from a metal alloy with a more "active" voltage (more negative reduction potential / more positive oxidation potential ) than the metal of the structure.
DCVG (direct current voltage gradient) is a survey technique used for assessing the effectiveness of corrosion protection on buried steel structures. [1] In particular, oil and natural gas pipelines are routinely monitored using this technique to help locate coating faults and highlight deficiencies in their cathodic protection (CP) strategies.
Steel coatings may be applied to steel that will primarily be underwater if the coating has the required resistance to cathodic disbondment. Additional protection may be provided by materials like copper nickel or by usage of additional steel to thicken the area allowed for corrosion. Allowances of 0.1 to 0.3 mm per year are typical. [1]: Ch 4.2
Cathodic protection can also be applied by connecting a direct current (DC) electrical power supply to oppose the corrosive galvanic current. (See Cathodic protection § Impressed current cathodic protection (ICCP) .)
Another cathodic protection is used on the impressed current anode. [12] It is made from titanium and covered with mixed metal oxide. Unlike the sacrificial anode rod, the impressed current anode does not sacrifice its structure. This technology uses an external current provided by a DC source to create the cathodic protection. [13]
Corrosion prevention measures, including Cathodic protection, designing to prevent corrosion and coating of structures fall within the regime of corrosion engineering. However, corrosion science and engineering go hand-in-hand and they cannot be separated: it is a permanent marriage to produce new and better methods of protection from time to time.
Impressed Current Cathodic Protection (ICCP) is the method of corrosion prvention by injecting a current which is stronger than the "corrosion current" into the pipeline through soil (electrolyte) then, corrosion can not occur. Remember, corrosion takes place at the place where the current "goes out" from the pipeline into "soil (electrolyte)".
Ad
related to: impressed current cathodic protection method