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Method for evaluating rolled steel corrosive pitting probability by microcell electrochemistry

A technology for pitting and steel, which is applied in the field of micro-area electrochemical evaluation of steel pitting probability, can solve the problems of inability to quantitatively evaluate the probability of pitting corrosion, etc., to eliminate human interference, reduce pitting evaluation errors, and reduce human errors Effect

Inactive Publication Date: 2017-12-26
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

This method also has obvious shortcomings. The detection parameter "pitting corrosion potential" used in the standard needs to be obtained in the artificially prepared corrosion solution, which is very different from the actual environment, so the obtained detection results are qualitative results. The probability of pitting corrosion cannot be quantitatively assessed

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  • Method for evaluating rolled steel corrosive pitting probability by microcell electrochemistry
  • Method for evaluating rolled steel corrosive pitting probability by microcell electrochemistry

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Embodiment 1

[0029] Cut out square samples with a side length of 90 mm from 304 stainless steel and 15-5PH stainless steel, and divide the sample plate into 30 areas. Put the sample on the SKP test platform, and control the distance between the probe and the sample surface at 100 μm. The frequency of the probe parameters is 80Hz, and the amplitude is 30μm. One of the surface of the sample is the clean state after cleaning with deionized water, which is used to simulate the ordinary atmospheric environment; the other is the state of salt particles after spraying sodium chloride solution and drying, which is used to simulate the marine atmospheric environment.

[0030] The test adopts the surface scanning mode, the scanning step is 50 μm, and the scanning area in each area is 3000 μm×3000 μm, and the two kinds of surfaces are tested respectively. After the test is completed, a three-dimensional potential distribution map is obtained, and the potential difference is calculated. Repeat the a...

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Abstract

The invention provides a method for evaluating rolled steel corrosive pitting probability by microcell electrochemistry, belonging to the field of corrosion evaluation. A method for calculating corrosive pitting occurrence probability according to rolled steel surface microcell potential distribution is provided. A scanning Kelvin probe is adopted for testing, so human factor disturbance can be eliminated and corrosive pitting evaluating error can be reduced. Meanwhile, a rolled steel corrosive pitting phenomenon is quantified to obtain an occurrence probability value, so the rolled steel corrosive pitting probability can be quantitatively evaluated. Therefore, compared with traditional test methods, the method has the advantages that personal error can be effectively reduced, and the rolled steel corrosive pitting occurrence probability can be quantitatively evaluated; an evaluation result is of great significance to novel steel variety development, engineering structure design for material selection and steel service life assessment.

Description

technical field [0001] The invention belongs to the field of corrosion evaluation, and in particular provides a method for evaluating the probability of pitting corrosion of steel by micro-area electrochemical. Background technique [0002] Steel is widely used in many fields due to its good corrosion resistance. However, the economic loss caused by the failure of steel products in our country reaches hundreds of billions of yuan every year. Local corrosion is one of the main failure modes of steel due to its concealment and suddenness. Therefore, it is of great significance to develop a method for evaluating the pitting corrosion probability of steel by micro-area electrochemistry to improve the service safety and service life of steel. [0003] At present, there are two main technologies for steel pitting detection: [0004] One is to put the steel sample into FeCl according to the national standard GB / T 17897-2016 3 Soak in the solution, and then according to the metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N17/02G01N1/32
CPCG01N17/006G01N1/32G01N17/02
Inventor 李晓刚杨颖程学群肖葵董超芳黄运华
Owner UNIV OF SCI & TECH BEIJING
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