High Temperature & High Pressure Electrochemical & Corrosion Rate Test System
High temperature and high pressure electrochemical and corrosion rate testing equipment, electrochemical and corrosion rate testing in laboratory-grade autoclaves
1. Material research and corrosion testing
As an essential equipment for corrosion laboratories, autoclaves have demonstrated their powerful scientific research and testing capabilities throughout the world. They have become synonymous with quality and reliability. Autoclaves simulate specific environmental conditions for material property research and process optimization. Under safe and effective operation, autoclaves can provide very harsh corrosion environments for corrosion rate testing materials and electrochemical research. Autoclaves have been widely used in environments such as hydrogen sulfide and supercritical water.
2. Corrosion coupon weight loss method
Corrosion coupons can provide information such as metal loss and corrosion rate, and can also reflect the distribution and form of corrosion. The technical standards for corrosion testing are mainly ASTM G1 for calculating metal loss, ASTM G46 for local corrosion analysis, and NACETM-01 for corrosion testing. Corrosion coupons are still the most reliable test method. Corrosion rate and corrosion form can be tested simultaneously with corrosion coupons. However, corrosion coupons are a relatively basic reference method that can only give the average corrosion rate during the experiment and cannot perform real-time online measurements. If continuous testing is required, a corrosion test sensor is required.
3. Static autoclave system
Corrosion coupons fixed in static autoclaves can evaluate the corrosion rate of materials and the corrosiveness of environmental media. Corrosion tests in autoclave systems can measure uniform corrosion, localized corrosion, and environmentally induced corrosion cracking. The sensitivity of materials to environmentally induced cracking (EIC), such as stress corrosion cracking (SCC) and hydrogen induced cracking (HIC), can be analyzed and judged using U-bend or C-ring test samples.
4. Electromagnetic stirring dynamic autoclave system
While coupons can provide useful corrosion test measurements in static autoclaves, additional benefits are gained by stirring the autoclave to maintain a flowing, homogeneous chemical medium.
A) Electromagnetic stirring system
The electromagnetic stirring system can be used for heavy load tests, including a magnetic drive, an AC variable frequency electrode, a stirring shaft and an impeller, and an electrode speed controller.
The tachometer and LED display provide accurate revolutions per minute (RPM). The electromagnetic stirring system has passed the safety certification and can be used for hazardous media testing (such as hydrogen sulfide environment). The stirring shaft and accessories are made of C-276 Hastelloy.
2 mixing modes to choose from:
The impeller is installed on the shaft, the hanging piece is fixed, the shaft and the impeller are stirred,
The hanging piece is directly fixed on the stirring shaft, and the hanging piece is driven by the rotation of the shaft to carry out the test.
B) Electromagnetic stirring autoclave with circulation loop
In a closed autoclave system, corrosion products formed on the metal sample may dissolve into the medium solution, which may cause changes in the test conditions. If an external circulation loop (RTL) is added, the medium solution can be replaced, so that the medium composition in the autoclave can be perfectly controlled.
C) Rotating Electrode
Featured rotating electrode that can be mounted on the stirring shaft
The rotating electrode used in the autoclave provides a feasible device for conducting related experiments under high pressure and high temperature conditions. The rotating electrode is electrically insulated between the stirring shafts. The electrode outputs the current signal through a special connection, allowing the user to perform electrochemical measurements.
Autoclave systems pressurized with corrosive gases
In the oil and gas industry, corrosion testing at high temperatures and pressures often involves CO2 and H2S gases. The acidic substances produced by these gases form a highly corrosive medium.
Since CO2 and H2S will dissolve in pure water and salt water media, it is not an easy task to load the partial pressure of CO2 and H2S to the required value, and their concentration has a great influence on the experimental results. When the autoclave is pressurized, CO2 and H2S between the wave phase and the gas phase must be considered. In addition, the solubility of the gas in water is also affected by temperature.
There are a number of methods that can be used in practice, but none are equivalent and the final method will depend on the performance of the type of experiment. The engineer can guide and advise the user on the precise and effective pressurization procedure.
1. Kettle body:
The autoclave is made of integral alloy forging, without lining and welding. The manufacturing test complies with ASME VI standards. According to different experimental requirements, the volume can be selected in different specifications such as 1 liter, 2 liters, 5 liters, and 7.5 liters.
Temperature selection range: room temperature ~ 600°C;
Pressure selection range: normal pressure ~ 100MPa.
2. Heating system:
Adopt SCR thyristor heating system, which has high power, low energy consumption and precise temperature control.
3. Electromagnetic stirring system:
This system can be used to perform dynamic high temperature and high pressure corrosion experiments in an autoclave. The stirring speed is continuously adjustable. This system can also be used in conjunction with a rotating electrode assembly to perform high temperature and high pressure dynamic electrochemical experiments.
4. Computer control system:
AC-12T control system uses PLC industrial programmable controller as control unit, built-in LABVIEW operation program, realizes human-computer dialogue through color LCD touch screen, and sets experimental parameters
Walk, monitor and record.
The system also has a safety protection alarm mechanism, which does not require operators to be on duty for a long time.
5. RTL loop test loop:
The circulation loop can inject fresh experimental solution into the high temperature and high pressure experimental area in the autoclave through a plunger circulation pump, and replace the experimental solution with corrosion products, so as to always keep the experimental medium balanced and stable throughout the entire experimental process.
The operator can set the injection volume of the solution according to the experimental needs.
6. Electrochemical testing system
If the user has a constant potential instrument and needs to conduct high temperature and high pressure electrochemical experiments, he can choose a high temperature and high pressure (rotating) electrode assembly and use it with a constant potential instrument to conduct dynamic/static electrochemical experiments. The technical specifications of the autoclave test system are as follows:
standard:
ASTM G111, ASTM G170, ASTM G59 and ASTM G96, ASTM G129, E399 and NACETM-0198
Features:
Integral forged alloy, no welds, no lining;
Magnetic stirring system, no connection, and reliable dynamic sealing performance;
Touch screen computer control system, powerful functions and easy operation;
