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Rapid evaluation method for stress corrosion sensitivity of low-alloy structural steel in atmospheric environment

A stress corrosion and atmospheric environment technology, applied in the direction of weather resistance/light resistance/corrosion resistance, strength characteristics, using repetitive force/pulse force to test the strength of materials, etc. The effect of improving corrosion resistance, reducing defective product rate and improving surface quality

Pending Publication Date: 2020-02-21
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the long incubation time of stress corrosion and the special conditions, there is no universal rapid evaluation method at present.
The existing stress corrosion evaluation methods are generally only applicable to corrosion-resistant materials such as stainless steel, and are not applicable to the relevant evaluation of low-alloy structural steel.
Moreover, there is no rapid evaluation method for stress corrosion cracking behavior in the atmospheric environment in the world. At present, indoor and outdoor ambient atmosphere exposure tests are usually used for simulation research and test evaluation. This method is complicated to operate, high in cost, difficult to implement and takes a long time.

Method used

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  • Rapid evaluation method for stress corrosion sensitivity of low-alloy structural steel in atmospheric environment
  • Rapid evaluation method for stress corrosion sensitivity of low-alloy structural steel in atmospheric environment
  • Rapid evaluation method for stress corrosion sensitivity of low-alloy structural steel in atmospheric environment

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Experimental program
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Effect test

Embodiment 1

[0026] The sample undergoes plastic deformation under constant stress, and is prone to stress corrosion cracking under the promotion of anodic dissolution. Therefore, the U-bend sample is selected for stress loading to test its stress corrosion sensitivity in the Xisha marine atmospheric environment. Using 5% NaCl+0.05% CaCl 2 +0.05%Na 2 SO 4 After mixing, a solution adjusted to pH 4 with dilute hydrochloric acid was used as the accelerating medium. Taking the atmospheric corrosion environment spectrum (Table 2) of Xisha Test Station as a reference, the indoor environment spectrum is designed by using the equivalent calculation method.

[0027] Table 2 Ocean Atmospheric Environmental Spectrum of Xisha

[0028]

[0029] Equivalent conversion between Xisha atmospheric environment spectrum and standard humid air: 1) Convert the hours of humid air action at each temperature in Xisha atmospheric environment spectrum to the action hours of standard humid air with temperature T...

Embodiment 2

[0035] The sample undergoes plastic deformation under constant stress, and is prone to stress corrosion cracking under the promotion of anodic dissolution. Therefore, the U-bend sample is selected for stress loading to test its stress corrosion sensitivity in simulated seawater (3.5% NaCl solution). 3.5% NaCl solution is used as the simulated solution, and the U-bend sample is selected for the test. Before loading, the outer surface must be polished to 1000 mesh or above with metallographic sandpaper. The surface of the sample is degreased (for example, degreased with absolute ethanol and acetone), rinsed with distilled water, dried, and set aside.

[0036] The potentiodynamic polarization test was carried out in the prepared solution, and the results were as follows image 3 shown

[0037] Calculate R SCC =(I corr -I 0corr ) / I 0corr =(7.47e- 4 -1.05e- 5 ) / 1.05e- 5 =70.14, the stress corrosion sensitivity of low alloy structural steel in this atmospheric environment is...

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Abstract

The invention discloses a rapid evaluation method for stress corrosion of low-alloy structural steel in an atmospheric environment. The rapid evaluation method is a stress corrosion sensitivity evaluation method constructed based on electrochemical tests and based on atmospheric environment stress corrosion indoor and outdoor simulation and acceleration research data and a stress corrosion electrochemical mechanism thereof. Compared with a traditional outdoor atmospheric exposure test method, the rapid evaluation method has high operability in indoor tests and short test time, the evaluation of stress corrosion performance of the low-alloy steel can be realized, and the rapid evaluation method can be further used for the research and development, production and relevant evaluation and testing in the material selection process of the low-alloy structural steel. The rapid evaluation method has the characteristics of simulation, acceleration and effectiveness, a new method is provided forthe evaluation study of the stress corrosion sensitivity of the low-alloy structural steel in the atmospheric environment, and thus an advantageous basis is provided for the use and protection of materials.

Description

technical field [0001] The invention relates to a rapid evaluation method for stress corrosion of steel under an atmospheric environment, and belongs to the field of metal material corrosion test methods. Background technique [0002] Atmospheric corrosion is the corrosion with the largest number, the widest coverage and the most destructiveness in metal corrosion. Stress corrosion refers to the failure phenomenon of metal under the combined action of tensile stress and corrosive environment, which generally occurs in corrosion-resistant alloy and low-alloy steel structures. However, due to the long incubation time and special conditions of stress corrosion, there is no universal rapid evaluation method at present. The existing stress corrosion evaluation methods are generally only applicable to corrosion-resistant materials such as stainless steel, and are not applicable to the relevant evaluation of low-alloy structural steel. Moreover, there is no rapid evaluation metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/32G01N17/00G01N17/02
CPCG01N3/08G01N3/32G01N17/006G01N17/02G01N2203/006G01N2203/0075G01N2203/024
Inventor 赵柏杰范益蔡佳兴杨文秀王世琦刘智勇黄灿李晓刚
Owner NANJING IRON & STEEL CO LTD
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