On the interference of cathode voltage cone of protected object
Release time: 2022-08-28
The current at the defect of pipeline anticorrosion coating enters into cathodic protection and forms cathodic voltage cone in soil. For anticorrosive coating with strong mechanical strength, there are only a few defects of anticorrosive...
Anticorrosion measures for pressure vessels in industry
Release time: 2022-08-03
Pressure vessel plays an important role in chemical production. However, in the actual operation process, due to the influence of operating conditions such as medium, temperature and pressure, the pressure vessel will produce damage and ...
Cathodic protection for tunnel of DC Railway
Release time: 2022-07-16
According to the equipment affected by stray current, the maximum allowable anode potential change of metro tunnel or new special tram is 0.1 V in big cities, and the single power supply part or the whole tunnel within the limit value of...
Development process of outer wall protection of urban gas pipeline network
Release time: 2022-06-29
In our country, the protection method of buried gas pipeline in the early stage is only a single method of petroleum asphalt and glass fiber cloth external anti-corrosion coating, most of which are in the field operation, so it is diffic...
Atmospheric corrosion of oil and gas pipelines
Release time: 2022-06-21
Pipeline metal surface exposed to the atmosphere, due to the role of water and oxygen damage, known as atmospheric corrosion. The reason is that there is water vapor in the atmosphere, which condenses on the metal surface to form a water...
Potential measurement of cathodic protection pipeline and storage tank
Release time: 2022-06-09
If the applied voltage such as IR drop in soil is not considered, the potential measurement of pipeline and tank in soil will be wrong. In general, under the flow of protection current, the electrified potential of the protected dev...
Harm and protection of resistance coupling
Release time: 2022-05-23
Resistance coupling mainly occurs in the grounding body near the strong streamline of the pipeline. Due to the large fault current, hundreds to thousands of amperes of current enter the ground through the grounding body, forming a strong...
Repair of anticorrosive coating in cathodic protection construction
Release time: 2022-04-29
In recent years, the excellent performance of three-layer PE anti-corrosion coating makes it the first choice for new oil and gas pipeline projects in China. However, there are many factors during the production, construction and operati...
What is the effect of seabed environment on cathodic protection?
Release time: 2022-04-22
There are many factors that affect the corrosivity of the seabed soil when the submarine pipeline is buried or placed on the seabed and directly contacts with the seabed soil. The main factors include the soil resistivity, redox potentia...
Stress corrosion of magnesium alloys
Release time: 2022-04-06
Like other metal materials, stress corrosion cracking of magnesium alloy anode materials only occurs under tensile stress. The SCC rate increases with the increase of tensile stress. Compressive stress can improve the stress corrosion re...
Application range of reference electrode
Release time: 2022-03-28
When measuring the potential of various electrodes, the reference electrode is usually used as a reference. The measured electrode and the reference electrode accurately knowing the electrode potential value constitute a battery. When me...
Construction process of regional cathodic protection
Release time: 2022-03-16
When filling coke, it should be crushed to particle size less than 15mm. If the particle size is too large, the anode grounding resistance will increase and the operation energy consumption will be increased. When using sodium sulfate, b...