45 results about "Electrochemical noise" patented technology

The invention provides an electrochemical noise method, apparatus and system for estimating parameters of interest related to corrosion rates of an electrically conductive article, the method comprising: placing a working electrode, a reference electrode, and a counter electrode in an environment of interest; measuring potential at open circuit between the working electrode and the reference electrode over time; placing the working electrode under a potentiostatic control; measuring current between the working electrode and the counter electrode for a predetermined period of time, the period of time of measurements may be extended to include a transient event; and estimating the corrosion rate.

The invention discloses a simulation experiment device for hydrostatic stress corrosion electrochemical action of a magnesium alloy and an experiment method of the simulation experiment device. The simulation experiment device comprises an electrolyte tank, a test device, a computer terminal and an electrochemical workstation, wherein the test device is placed in the electrolyte tank; electrolyte in the electrolyte tank is forced by a high-precision peristaltic pump to cyclically crawl. The simulation experiment device is simple in overall structure, and static pressure can be continuously adjusted. The experiment method is to adjust a screw rod of the test device to apply different sizes of hydrostatic stress on a magnesium alloy test sample, and then adjust the flow rate of the electrolyte through the peristaltic pump to really simulate a living body microenvironment in vitro, so as to carry out a series of electrochemical test operations on open circuit potential, a polarization curve, an alternating current impedance spectrum and electrochemical noise; test results are real and stable, and the reappearance and the reproducibility are high. The simulation experiment device and the simulation method can fully meet the requirement of the magnesium alloy for relevant research use on bearing of the hydrostatic stress in a human bone microenvironment.

The invention discloses an oceanic capacitive electrode and is applied to ocean electric field measurement in the field of geophysical exploration. The oceanic capacitive electrode mainly comprises a capacitive electrode body made of metal materials and a protecting structure, and an insulating layer is arranged on the surface of the capacitive electrode body and is high in insulating property and corrosion resistance. The oceanic capacitive electrode has the advantages that direct contact between the capacitive electrode body and external environment media is avoided by the insulating layer, the electrode body and external electrolyte form a capacitor, and an external electric field is measured by means of capacitive coupling; in the presence of the insulating layer, chemical reaction between the electrode and ions in seawater is avoided, electrochemical noise generated during the chemical reaction is further avoided, and the electrode can achieve lower noise level; meanwhile, stabilization time for the electrode to establish balance is shortened, and continuous consumption during electrode use is avoided.

The invention relates to an electrochemical noise sensor for metal pipeline outer surface corrosion detection. The electrochemical noise sensor comprises a shell (1), a reference electrode (2), a counter electrode (5), an electric contact (4) directly contacted with the surface of a pipeline to be detected, and an adjustable support pillar (3). The reference electrode (2) and the counter electrode (5) are fixedly connected with the lower part of the shell (1); the adjustable support pillar (3) and the shell (1) are fixedly connected; the lower ends of the reference electrode (2) and the counter electrode (5) are isolated from a steel pipeline to be detected through wetting filter paper; the upper part of the support pillar (3) is connected with the shell; the distances from the reference electrode (2) and the counter electrode (5) to the metal surface to be detected is adjusted through adjusting the length of the adjustable support pillar.

The present invention discloses a distillation apparatus tower top system dew point corrosion test method. The method is as follows: 1) processing a working electrode and a corrosion coupon; 2) an etching solution is poured into a five-necked flask, a second (II) three-electrode system is fixed in three mouths of the five-necked flask, the five-necked flask is fixed in a numeric display oil bath pot; 3) other two ports of the five-necked flask are respectively connected with an inlet and an outlet of a condenser horizontal inner tube, the corrosion coupon is fixed in the condenser horizontal inner tube, a first (I)three-electrode system is fixed in the upper portion of a condenser inclined tube; and 4) the five-necked flask is heated by the numeric display oil bath pot, a first-section condenser outer tube cooling water inlet and a second-section condenser outer tube cooling water outer are opened, the cooling water flow is adjusted, then acidic aqueous electrochemical tests, corrosion weight loss experiments under dew formation environment and electrochemical test experiments under dew formation environment can be performed. The electrochemical test and corrosion weight loss dew point corrosion test are can be performed by the method, tests of electrochemical impedance spectroscopy, electrochemical noise and the like under dew point environment can be realized, and data reliability can be verified by weight loss experiments.

The invention provides a device using the electrochemical noise method to measure mechanical property of a corrosion product film in situ, belonging to the corrosion product film measurement field. The device simulates corrosion of a sample in high-temperature high-pressure CO2 environment through a four-point bending loading and load mechanism and a high temperature high pressure autoclave, and records deformation and received load of the sample when a signal changes suddenly through an electrochemical noise signal of the corrosion product film under an external force, which is generated when an electrode system measures the sample, thereby realizing in situ measurement of the mechanical property of a corrosion product in the high-temperature high-pressure CO2 corrosion environment, solving the problem that the measurement of the mechanical property of the corrosion product film can not be performed in the corrosion environment. The device also can obtain corresponding relations between environmental parameters and the mechanical property of the corrosion product film formed at different medium temperatures, gas pressures, periods and other environmental parameters.

The invention relates to a sensor for atmosphere corrosion detection of a steel member or a test piece. The sensor comprises a supporting column for supporting the sensor, a reference electrode (2), a counter electrode (1), a working electrode electric contact lead wire (5) which is in direct contact with the surface of the steel member or test piece to be detected, a plastic net (3) and a magnet (4), and is characterized in that the magnet (4) is fixed at the lower end of the supporting column; and the lower ends of the reference electrode (2) and the reference electrode (2) are separated from the surface of the steel member or test piece to be detected through the plastic net (3). The invention also provides a method for detecting the atmosphere corrosion detection of the steel member or the test piece by adopting the sensor. With the adoption of the sensor and the method, the on-site corrosion detection of the large-size steel member or test piece can be realized in real time; and an adopted electrochemical noise technology has no interferences on a detected system and belongs to nondestructive testing.

The invention relates to a method for preparing a high-temperature electrochemical working electrode, and belongs to the technical field of electrochemical corrosion measurement and material characterization. The method is characterized in that: a welded double electrode is fixed in a base; a PVC pipe at a proper size is connected with the base and is sealed by an aluminum foil; commonly used Portland cement is used as a packaging material; the ordinary PVC pipe is used for packaging an infusion grinding tool; and finally, the PVC pipe is softened and stripped at a high temperature to prepare the high-temperature working electrode with high corrosion resistance and high temperature resistance. The whole working electrode is divided into two work testing parts and is convenient to monitor electrochemical noise under a high-temperature corrosion condition. The method has the advantages of low cost, simple process and easy operation, and is favorable for accurately monitoring the material corrosion performance in real time in the corrosion process under the high-temperature corrosion condition. The method is suitable for all metal matrixes for electrochemical detection, such as stainless steel, carbon steel and the like, and can be used in law measurement, mechanism inspection and characterization of material performance in a corrosive environment.

The invention relates to the field of stress corrosion measurement and in particular relates to a portable variable load digital stress corrosion measurement device. The problems that the precision is insufficient by taking a spring as a load application source, the spring is difficult to replace and the like in the prior art are solved. According to the measurement device, a tensile test piece is arranged between a movable tensile head and a stationary tensile head; one end of the tensile test piece stretches into the stationary tensile head, and the other end of the tensile test piece and the movable tensile head stretch into one end of a liquid pool to be connected with each other; the other end of the movable tensile head is connected with a worm gear reducer through a transmission shaft; a loading force measurement sensor is arranged on the transmission shaft. The tensile test piece, a reference electrode and an auxiliary electrode form a three-electrode system, and the three-electrode system is connected with an electrochemical workstation and a computer to perform electrochemical testing. The device can be used for conventional constant stress and constant strain experiments and also can be combined with the electrochemical workstation for performing electrochemical polarization, electrochemical impedance spectroscopy and electrochemical noise measurements under the actions of constant stress and variable load.

The invention relates to a dew point corrosion monitoring method based on electrochemical noise, and mainly solves the problem that a dew point corrosion condition cannot be reflected in a real-time manner in the prior art. The method adopts the technical scheme that main components comprising a three-electrode-assembly probe, a zero-resistance ammeter, a high-resistance voltmeter, an A/D convertor and a computer are adopted; the three-electrode-assembly probe comprises a reference electrode assembly and two working electrode assemblies, and the reference electrode assembly is connected with the high-resistance voltmeter; the first working electrode assembly is connected with the zero-resistance ammeter and the high-resistance voltmeter respectively, and the second working electrode assembly is connected with the zero-resistance ammeter; potential noise generated by the high-resistance voltmeter and current noises generated by the zero-resistance ammeter enter the A/D convertor, and the A/D convertor is connected with the computer; the reference electrode assembly comprises at least one reference electrode, the first working electrode assembly comprises at least one working electrode, and the second working electrode assembly comprises at least one working electrode. The technical scheme well solves the problem. The dew point corrosion monitoring method can be used in dew point corrosion monitoring of oil refineries.

A blood analysis micro system with multiple ion sensing functions is manufactured by using a micro electro mechanical system (MEMS) process and a packaging technology. The blood analysis micro system is provided with an integrated miniature reference electrode, thus the size of a chip is miniaturized. The blood analysis micro system is provided with a grid sensing region larger than a planar ion selection electrode (Planar ISE) or an ion sensing filed effect transistor (ISFET), thus unnecessary signal interference can be effectively avoided, and possibility of packaging difficulty and liquid leakage is reduced. Therefore, the blood analysis micro system has the advantages of light weight, thinness, short size, high reaction speed, high precision, lower cost and high compatibility with an IC process, and has excellent electrochemical properties such as extremely high long-term potential stability, extremely low offset-compensating potential, small alternating current impedance, stable dynamic reference potential, low electrochemical noise, high electrode reproducibility and the like.

The invention relates to a noise acquisition system based on an electrochemical noise corrosion signal. The noise acquisition system comprises a sensor, a signal conditioning module, a cRIO acquisition module and an upper computer, wherein the sensor is an electrochemical noise sensor and is connected with the cRIO acquisition module through the signal conditioning module; the cRIO acquisition module is an acquisition controller of the system and is connected with the upper computer through an Ethernet interface; the upper computer is a computer for running electrochemical noise system software; the signal conditioning module is an acquisition signal conditioning circuit. The noise acquisition system based on the electrochemical noise corrosion signal, provided by the invention is a multi-channel electrochemical noise test instrument and can realize the acquisition, the storage and the display of electrochemical noise data, process the data through electrochemical noise data processing software in the upper computer, extract characteristic parameters and characterize the corrosion property.

The invention discloses a temperature controllable electrolytic cell device simultaneously used for electrochemical experiments and slow strain rate tensile tests and a using method thereof. Accordingto the device, an electrolytic cell is formed in a reaction tank, and a circulating water tank is formed along the outer ring of the electrolytic cell, so that the temperature control of an experimental environment in the electrolytic cell is completed while a tensile test is carried out, and the fixing and sealing of a tensile sample are completed through the combination of a sealing plug, a sealing gasket and a rotary cover. The device can perform electrochemical tests, such as polarization curve measurement, electrochemical alternating current impedance spectrum, electrochemical noise tests and M-S curve measurement, on samples at different temperatures and under different stress conditions, and is used for analyzing the corrosion condition of the material.

The invention discloses a method for detecting corrosion of submarine pipelines. The method comprises the following steps of: acquiring alternating-current impedance, acquiring detection frequency and determining pipeline conditions. The detailed steps are as follows: loading alternating-current disturbance signals to one end of a pipeline, receiving alternating-current response signal generated according to the corrosion state of the pipeline at the other end of the pipeline, and acquiring alternating-current impedance according to the alternating-current disturbance signals and the alternating-current response signals; changing the frequency of the alternating-current disturbance signals loaded on the pipeline, acquiring the alternating-current impedance of the pipeline under different frequencies and selecting maximum value and minimum value and corresponding maximum detection frequency and minimum detection frequency; and respectively loading current signals with maximum detection frequency and minimum detection frequency to one end of the pipeline, receiving the current signals at the other end of the pipeline, extracting electrochemical noise from the current signals and carrying out fourier transformation and maximum-entropy-method transformation on the electrochemical noise to obtain characteristic parameters of a power density spectrum.

The invention relates to a sensor suitable for high-temperature high-pressure water environment electrochemical noise measurement of nuclear power environment. The sensor comprises a high-purity antimony electrode as a reference electrode, stainless steel as a counter electrode of which the surface is sprayed with ZrO<2+>Y2O3 and a stainless steel housing. A porcelain tube with double holes is fixedly installed in the stainless steel housing. Two electrodes are fixed in the porcelain tube, and the front end is stretched out from the front end of the porcelain tube. A copper guide wire guided from the rear ends of two electrodes passes through the double holes of the rear end of the porcelain tube, and is sealed by a ceramic powder sealant. The copper guide wire guided from the rear ends of the counter electrode and the reference electrode passes through the porcelain tube, so that the electric insulation and heat insulation of the copper guide wire and the main stainless steel housing can be guaranteed.

The present invention provides a method and apparatus for estimation of general and localized corrosion penetration rates of metallic materials and objects. The invention can also be used to discriminate between general and localized corrosion. A one, two or three electrode probe having electrodes (101, 102, 103) made of the same material as the material being monitored is located in the same corrosive environment as the material being monitored. An electrochemical harmonic analysis is performed and electrochemical noise signals are monitored, and the resulting responses are analyzed and compared to discriminate between general and localized corrosion attack and to determine a localized corrosion penetration rate. A law frequency sine wave is applied to the working electrode. Harmonic analysis of the electrode response provides information regarding the general corrosion rate and the stern-geary constant. Electrochemical noise analysis of the electrode response and comparison with harmonic data provides a means of determination of localized corrosion penetration rate.

The invention relates to an electrochemical noise corrosion type distinguishing method based on a support vector machine. The method comprises the following steps: establishing an input feature vector; performing diversity processing; finding the best SVM parameter; training to obtain the best SVM model by a training set; and predicting the electrochemical noise corrosion type by using the SVM model. According to the electrochemical noise corrosion type distinguishing method based on the support vector machine, provided by the invention, the corrosion type can be distinguished by data obtained from an electrochemical noise corrosion experiment, the method can well complete a corrosion type distinguishing task, and the accuracy of a test set can be up to 100%; in a stability aspect, since the support vector machine adopts a structural risk minimization principle, the support vector machine is stable; the training results are very close, and the fitting and under-fitting conditions do not appear, so that the prediction accuracy is high.

The invention relates to an entropy rate-based electrochemical noise corrosion signal processing method, which comprises the following steps: cleansing original data; performing direct current removal on data of each small file by using a wavelet removal method to obtain time data; signifying the time data; calculating probability distribution and a transfer matrix; calculating to obtain an entropy rate value; analyzing the size relation among entropy rates of three corrosion systems; according to a sample, verifying the entropy rate value; and evaluating the entropy rate processing results. In the entropy rate-based electrochemical noise Corrosion signal processing method provided by the invention, each entropy rate is used as a new characteristic value for characterizing an electrochemical corrosion system to represent the degree of chaos of the corrosion system; the data processing results show that each entropy rate can well distinguish among different corrosion systems, and cannot be affected by the concentration of a solution; and finally, an entropy rate parameter and a noise resistance performance parameter are compared to obtain the advantages and the disadvantages of the use of the entropy rate.

The invention relates to an electrochemical noise experimental method at a high temperature and a high pressure. The method comprises the following steps: manufacturing an electrochemical noise sensor; arranging equipment required by experiments; constructing an experimental data collecting system; putting into a test solution; establishing a high-temperature and high-pressure environment; recording an electrochemical noise changing process and the like. Aiming at the condition that electrochemical noise in a high temperature and high pressure environment is the blind point and difficulty all the way in the field of electrochemical noise, the electrochemical noise experimental method at the high temperature and the high pressure is a direction of development in the future. The mechanism of corrosion at a constant temperature is basically known by people while researches on the corrosion mechanism under the high temperature and high pressure water environment are few. The primary cause is shortage of researching paths and backwardness of instruments as well as huge difficulty on researches in the high temperature and high pressure water environment. However, emergence of electrochemical noise makes researches on corrosion mechanism at the high temperature and high pressure possible.