45 results about "Electrochemical noise" patented technology

An electrochemical noise method, apparatus and system calculates parameters of interest related to corrosion rates of an electrically conductive article. The method involves placing a test electrode, a reference electrode, and an auxiliary electrode in an environment of interest; placing the test electrode under potentiostatic control regime for a potential scan; measuring the relationship of current v. potential (polarization resistance, Rp) of the test electrode relative to the reference electrode during a first period; switching from potentiostatic control to the open circuit potential (OCP) of the test electrode; monitoring the OCP of the test electrode during a second period; determining ΔI from the relationship Rp=ΔV / ΔI, where ΔV is measured over a second period of time; and calculating the localized corrosion from the measured potential and current data.

The invention discloses a method for detecting the anticorrosion performance of 304 stainless steel under a high temperature condition. According to the method, an electrode system is installed in a high temperature high pressure reactor; and an Autolab302N electrochemical work station is used to measure the electrochemical noise spectrum of 304 stainless steel in a water solution of H3BO3 (1500ppm) and LiOH (2.3ppm). The electrode system comprises a work electrode device and a reference-counter electrode device. The upper end of the work electrode device is provided with an upper turnbuckle structure and the lower end is provided with a lower turnbuckle structure. A junction pole is arranged in a steel pipe; a first nut, a second nut, and a third nut are sequentially arranged on the steelpipe; the lower end of the junction pole is connected to a work electrode sample; a reference electrode and a counter electrode are arranged in the reference-counter electrode device; an upper insulation layer, an upper sealing layer, a double hole ceramic sheet, a lower sealing layer, and a lower insulation layer are arranged in the steel pipe in sequence from top to bottom; the upper end of the steel pipe is provided with an upper fastening nut, and the lower end of the steel pipe is provided with a lower fastening nut. The anticorrosion performance of 304 stainless steel decreases as thetemperature rises at a temperature of 25-250 DEG C.

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.