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Life assessment method of atmospheric corrosion of low-alloy corrosion-resistant steel

A technology for atmospheric corrosion and life assessment, applied in weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve difficult material corrosion life evaluation and prediction, lack of simulation effect of marine atmospheric environment, and lack of dry-wet alternation and other issues to achieve the effect of low cost, high reliability and high correlation

Inactive Publication Date: 2020-02-21
NANJING IRON & STEEL CO LTD
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Problems solved by technology

Although the hanging film exposure has the characteristics of high accuracy, the test period is long and the cost is high; although the salt spray intensified test can strengthen a single environmental factor to achieve acceleration, this type of method does not have the function of alternating dry and wet, and is not suitable for actual ocean conditions. The atmospheric environment simulation effect is lacking, and the indoor and outdoor correlation is also poor
The change rule of the cycle test data is close to that of the real environment test data, but its acceleration still needs to be determined by the coupon test data
The above test methods have advantages and disadvantages, and it is difficult to quickly evaluate and predict the corrosion life of materials

Method used

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  • Life assessment method of atmospheric corrosion of low-alloy corrosion-resistant steel
  • Life assessment method of atmospheric corrosion of low-alloy corrosion-resistant steel
  • Life assessment method of atmospheric corrosion of low-alloy corrosion-resistant steel

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Embodiment 1

[0034] This embodiment provides a method for evaluating the corrosion life of low-alloy corrosion-resistant steel in a marine atmospheric environment, including the following steps:

[0035] Step 1: The natural environment exposure corrosion test samples and indoor accelerated corrosion test samples are made of the same low-alloy steel material. According to GB / T 25834-2010, the outdoor air exposure test was carried out, the test site was Sanya City, the test time was two years, and the test period was 3, 6, 12 and 24 months.

[0036] Step 2: Indoor accelerated corrosion samples are carried out in a laboratory simulation environment. The laboratory accelerated corrosion test solution uses 3.5% NaCl+0.01mol / L NaHSO3+0.01mol / L HNO3, the test temperature is 40±2°C, the RH is 90%, the continuous salt spray time is 20min, and the immersion and drying times are respectively 20min and 80min, with 120min as a cycle, 36 cycles constitute an acceleration cycle.

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Abstract

The invention discloses a life assessment method of atmospheric corrosion of low-alloy corrosion-resistant steel. The life assessment method simulates an atmospheric environment where the low-alloy corrosion-resistant steel exists. According to the method, a corrosion life prediction model is established, an electrochemical polarization test is performed, therefore, the acceleration rate of corrosion can be quickly calculated, the corrosion life of the material is assessed, and the method has high reliability and high relativity. The method is wide in application, short in time, low in cost and high in accuracy, solves the defects of existing evaluation methods, is suitable for corrosion research and corrosion life rapid evaluation on all types of low-alloy corrosion-resistant steel in various atmospheric environments and has important significance for both application and popularization of the corrosion-resistant steel.

Description

technical field [0001] The invention relates to a life evaluation method for atmospheric corrosion of steel, and belongs to the field of metal material corrosion test methods. Background technique [0002] Effective evaluation of corrosion life is one of the important factors limiting the application and development of low-alloy corrosion-resistant steels. At present, the life evaluation of carbon steel, low alloy steel, corrosion-resistant and weather-resistant steel, stainless steel and other materials mainly includes: coupon exposure test, salt spray intensification test and accelerated immersion test. Although the hanging film exposure has the characteristics of high accuracy, the test period is long and the cost is high; although the salt spray intensified test can strengthen a single environmental factor to achieve acceleration, this type of method does not have the function of alternating dry and wet, and is not suitable for actual ocean conditions. The atmospheric e...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01N17/02
CPCG01N17/006G01N17/02
Inventor 范益陈林恒刘智勇程焕林
Owner NANJING IRON & STEEL CO LTD
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