Predication method for corrosion service life of metal material

A metal material and life prediction technology, which is applied in the direction of analysis materials, weather resistance/light resistance/corrosion resistance, measuring devices, etc., can solve problems such as difficult corrosion prediction research, and achieve good prediction results

Inactive Publication Date: 2018-06-01
武汉钢铁有限公司
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  • Abstract
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Problems solved by technology

[0005] In order to solve the above problems, the purpose of the present invention is to provide a method for predicting the corrosion rate life of metal m

Method used

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  • Predication method for corrosion service life of metal material
  • Predication method for corrosion service life of metal material
  • Predication method for corrosion service life of metal material

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Embodiment Construction

[0025] From 1983 to 1993, a 10-year corrosion test of weathering steel was carried out in Wuhan area. The test steel is 09CuPTi weathering steel, and its chemical composition is shown in Table 1. The test method is carried out according to GB / T14165- "General Requirements for Field Tests of Atmospheric Corrosion Tests of Metals and Alloys". The test material faces south and is tested at an angle of 45° to the ground. After the samples exposed for different periods were taken back, they were derusted with derusting solution. After derusting, they were rinsed with distilled water and dried in cold air, then weighed, and the corrosion loss weight was calculated, as shown in Table 2.

[0026] Table 1 Chemical composition of 09CuPTi weathering steel

[0027]

[0028] Table 2 Corrosion test data of weathering steel

[0029]

[0030] Let X 0 (t) is the corrosion rate of weathering steel, then the original sequence is:

[0031] x 0 (t) = {52, 28.45, 16.69, 10.67}.

[0032]...

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Abstract

The invention belongs to the technical field of corrosion predication of metal materials and in particular relates to a predication method for the corrosion service life of a metal material. The predication method comprises the following steps: carrying out an atmospheric exposure test; calculating the corrosion weight loss of a test sample after the test sample is exposed for different exposure periods; establishing a predication model by utilizing original data, wherein an established differential equation is as follows: dX1/dt+aX1=b; determining parameters a and b by utilizing least-squaresalgorithm linear fitting; finally, obtaining a solution of the equation, i.e. X1(m)=[X0(1)-b/a]e-a(m-2)+b/a. By adopting the predication method provided by the invention, predicated precision is checked by utilizing a residual testing method and a posterior variance testing method; the corrosion service life of the metal material in a long period under an actual application environment can be accurately predicated.

Description

technical field [0001] The invention belongs to the technical field of corrosion prediction of metal materials, and specifically provides a corrosion life prediction method of metal materials. Background technique [0002] Metal materials are exposed to the natural environment for a long time, and different degrees of corrosion will cause different degrees of corrosion damage to steel structural parts, thus affecting their safety, reliability and durability. Therefore, great efforts must be made to solve the corrosion life prediction research of steel structural parts. This is of great significance to the protection and rational use of various resources, the construction of a conservation-oriented society, the realization of sustainable development, the strengthening of corrosion protection of materials, and the improvement of the safe service life of steel structures. [0003] Corrosion is a slow change process caused by the effect of materials and the environment. The cha...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01N5/04
CPCG01N5/04G01N17/006
Inventor 程鹏庞涛马颖彭浩郎丰军黄先球王辉李安平
Owner 武汉钢铁有限公司
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