scholarly journals The limits of the Pourbaix diagram in the interpretation of the kinetics of corrosion and cathodic protection of underground pipelines

2020 ◽  
Author(s):  
Jürgen Barthel ◽  
Rainer Deiss
Keyword(s):  
Cathodic Protection ◽  
Pourbaix Diagram ◽  
Underground Pipelines ◽  
Kinetics Of

The method of determining the polarization potential during corrosion surveys of underground pipelines

2020 ◽  
Vol 10 (2) ◽  
pp. 186-193
Author(s):  
Andrey А. Bolotov ◽  
Keyword(s):  
Cathodic Protection ◽  
Field Tests ◽  
Original Method ◽  
Polarization Potential ◽  
Operating Conditions ◽  
Measuring Instruments ◽  
Polarization Current ◽  
Protection Efficiency ◽  
Underground Pipelines ◽  
Experimental Use

Values of metal potentials, which exceed or equal to the potential at which the corrosion rate of the metal does not exceed 0.01 mm/year, in international practice, are a condition for the effectiveness of cathodic protection of underground pipelines. It is called polarization potential. The range of polarization potentials, which correspond to effective corrosion protection, was determined experimentally as a result of a large number of field tests in different operating conditions. The values of polarization potentials can vary from minus 0.65 V to minus 1.15 V, measured relative to copper sulfate electrode (C.S.E). There are cases during corrosion surveys of underground pipelines, when the measured values of polarization potentials with the help of measuring instruments, intended for this purpose, significantly exceed the maximum permissible value. The author offers an original method for determining the polarization potential based on the analysis of the dependence of the auxiliary electrode potential on the time after the interruption of the polarization current. The values of polarization potentials obtained using this technique are in the standard range. The method can be recommended for experimental use in corrosion surveys of underground pipelines in various operating conditions in order to confirm the compliance of the obtained results with the condition of cathodic protection efficiency.

Determination of corrosion rate in places of insulation damage of underground pipelines

2020 ◽  
Vol 2020 (48) ◽  
pp. 35-42
Author(s):  
R.M. Dzhala ◽  
◽  
B.Ya. Verbenets’ ◽  
V.R. Dzhala ◽  
V.P. Lozovan ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Corrosion Protection ◽  
Current Distribution ◽  
Cathodic Protection ◽  
Polarization Resistance ◽  
Cathodic Polarization ◽  
Electromagnetic Method ◽  
Insulating Layer ◽  
Underground Pipelines

The electromagnetic method of non-contact current measurements makes it possible to quickly monitor the state of passive (insulating coatings) and active (cathodic polarization) corrosion protection of underground pipelines (UP); detect places of unsatisfactory insulation, determine the transient resistance and its components (resistances of soil, insulating layer, polarization) in different sections, the area of insulation damage, the current distribution of cathodic protection of UP. In combination with contact measurements of direct and alternating voltages, ohmic and polarization potentials, it is possible to determine the polarization resistance and estimate the corrosion rate.

The Influence of Cathodic Protection on the Mechanical Properties of the X65 Pipe Weld

2007 ◽  
Vol 345-346 ◽  
pp. 1047-1050
Author(s):  
Gyu Young Lee ◽  
Dong Ho Bae ◽  
Y.P. Kim ◽  
C.M. Kim ◽  
S.Y. Cho
Keyword(s):  
Mechanical Properties ◽  
Residual Stresses ◽  
Corrosion Protection ◽  
Base Metal ◽  
Cathodic Protection ◽  
Electrochemical Reaction ◽  
Underground Pipelines ◽  
Protection Method ◽  
Protection Technology ◽  
Cathode Protection

The cathode protection method is a very useful corrosion protection technology for the underground pipelines. However, it has some problems that hydrogen generated by electrochemical reaction on the wet surface of the pipelines is attacked into the pipe weld, and make degradation of their mechanical properties. Therefore, in this study, welding residual stresses around of the X65 pipe weld, which is generally used as a material of the gas pipelines, were previously calculated. And next, by using the cathode protection method, artificially degraded the X65 pipe weld including base metal, assessed its influence on the mechanical properties of the X65 pipe weld.

scholarly journals Economic analysis of DC power sources used in impressed current cathodic protection of underground pipelines

2021 ◽  
Vol 14 (10) ◽  
pp. 897-904
Author(s):  
Muhammad Saddam Khan ◽  
◽  
Faizullah Khan Kakar ◽  
Muhammad Saeed ◽  
Akbar Khan ◽  
...  
Keyword(s):  
Economic Analysis ◽  
Cathodic Protection ◽  
Power Sources ◽  
Dc Power ◽  
Underground Pipelines ◽  
Impressed Current ◽  
Impressed Current Cathodic Protection

scholarly journals Energy efficient station for cathodic protection of underground metalic pipelines using pulsed current modes

2019 ◽  
Vol 121 ◽  
pp. 02010
Author(s):  
Alexander Shurayts ◽  
Denis Maruhin ◽  
Hajiahmed Zubailov ◽  
Yury Tomashevskiy
Keyword(s):  
Cathodic Protection ◽  
Protective Coatings ◽  
Steel Structure ◽  
Electric Circuit ◽  
Current Mode ◽  
Pulse Mode ◽  
Pulsed Current ◽  
Factors Affecting ◽  
Protective Potential ◽  
Underground Pipelines

The perspectivity of protection against corrosion by pulsed current in terms of improving the energy efficiency of cathodic protection stations (CPS) are shown. The cathode polarization of the steel structure to the required protective potential values is provided by the station-controlled current parameters, as well as the transition from the direct current mode to the pulse mode and vice versa. A combined load model was implemented, including a traditional electric circuit for replacing a pipeline and a model based on fuzzy rules (FR), which connect the value of protective potential with the state of protective coatings of an underground steel structure, as well as the parameters of exposure to a corrosive environment. The control of the CPS modes using the FR system made it possible to optimize the station’s power consumption modes taking into account the variability of external environmental factors affecting the underground pipelines.

scholarly journals Influence of the soil electrical conductivity in the area of the underground pipeline on energy efficiency of the cathodic protection

2018 ◽  
Vol 245 ◽  
pp. 07015 ◽  
Author(s):  
Vladimir Kiselev ◽  
Alexandr Kalyutik ◽  
Evgenij Rouzich
Keyword(s):  
Electrical Conductivity ◽  
Energy Efficiency ◽  
Cathodic Protection ◽  
Polarization Resistance ◽  
Electrochemical Corrosion ◽  
Underground Pipeline ◽  
Soil Electrical Conductivity ◽  
Underground Pipelines ◽  
Main Factors ◽  
High Dielectric

In this paper we consider main factors which have an influence on energy efficiency of the cathodic protection and analyze them. Cathodic protection is defined as the ratio of the electrical conductivity of electrolyte, which surrounds the underground (underwater) metal construction (pipeline) and its polarization resistance. The obtained results are correct first of all for the case of presence of modern qualitative insulation, which possess high dielectric properties and is made of, for example, polymers or its’ composition and is meant to be used for protection against electrochemical corrosion of the underground pipelines

Sign in / Sign up

Export Citation Format

Share Document