Rapid evaluation method for corrosion fatigue of aluminum alloy in industrial atmospheric environment

A technology for corrosion fatigue and evaluation methods, which is applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., and can solve problems such as high cost, time-consuming, complicated operation, etc.

Inactive Publication Date: 2021-08-13
CRRC QINGDAO SIFANG CO LTD
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  • Description
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Problems solved by technology

[0010] Existing evaluation methods for corrosion fatigue of metal materials usually have the problems of complicated operation, high cost and long time consumption, or it is difficult to accurately predict the corrosion fatigue life in service state despite the improved efficiency

Method used

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  • Rapid evaluation method for corrosion fatigue of aluminum alloy in industrial atmospheric environment
  • Rapid evaluation method for corrosion fatigue of aluminum alloy in industrial atmospheric environment
  • Rapid evaluation method for corrosion fatigue of aluminum alloy in industrial atmospheric environment

Examples

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Embodiment 1

[0052] This embodiment provides an evaluation method for corrosion fatigue of aluminum alloys, taking 6005A aluminum alloy as an example, specifically including the following steps:

[0053] Step 1: preparation of simulated experimental conditions;

[0054] The solution used in the simulation experiment is configured according to the actual industrial atmospheric environment; that is, 0.01mol / L NaHSO is used 3 The solution is used as a simulated solution of the industrial atmospheric environment;

[0055] At the same time, the pH was adjusted to 4.4 with dilute NaOH solution.

[0056] Step 2: Carry out fatigue loading on the sample;

[0057]Through the analysis of stress conditions, material state and mechanical-electrochemical critical conditions of corrosion fatigue, determine the fatigue load loading level and required fatigue cycles;

[0058] The specific implementation is: after the 6005A aluminum alloy is made into a tensile sample, it is subjected to 200,000 cycles o...

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Abstract

The invention relates to the technical field of metal material corrosion fatigue evaluation, and particularly relates to a rapid evaluation method for corrosion fatigue of an aluminum alloy in an industrial atmospheric environment. According to the evaluation method for corrosion fatigue of the aluminum alloy, the corrosion fatigue sensitivity grade of the aluminum alloy in the industrial atmospheric environment is evaluated by taking the relative difference degree of the corrosion current density of the aluminum alloy under different stress conditions as an index. The evaluation method provided by the invention has the advantages of strong indoor test operability, short test time consumption, rapidness and accuracy; and the method not only can realize rapid evaluation of the corrosion fatigue performance of the aluminum alloy, but also is suitable for related evaluation and test in the research and development, production and material selection processes of the aluminum alloy. A new method is provided for evaluating the corrosion fatigue sensitivity of the aluminum alloy in the industrial atmospheric environment, and a favorable basis is provided for use and protection of materials.

Description

technical field [0001] The invention belongs to the technical field of corrosion fatigue evaluation of metal materials, and in particular relates to a rapid evaluation method for corrosion fatigue of aluminum alloys in industrial atmospheric environments. Background technique [0002] Due to the advantages of low density, high specific strength, good corrosion resistance, and high hardness, aluminum alloys are widely used in aerospace, transportation, and construction fields. [0003] However, in many actual service situations, such as high-speed rail, ships, and mechanical structure bridges, aluminum alloys will not only be exposed to various atmospheric environments and suffer from corrosion, but also suffer from alternating loads and cause fatigue, which leads to corrosion of aluminum alloys Fatigue accidents occur frequently, and the environmental corrosion resistance and reliability of aluminum alloy materials are tested. Therefore, the corrosion fatigue failure of alum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02
CPCG01N17/02G01N17/006
Inventor 孙晓光韩晓辉张志毅李刚卿李帅贞吴向阳
Owner CRRC QINGDAO SIFANG CO LTD
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