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Method for simulating corrosion of weathering resistant steel in high-moist-heat marine atmosphere

A marine atmosphere and weather-resistant steel technology, applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problems of unreported test methods and achieve good reproducibility

Inactive Publication Date: 2016-06-22
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there are many test methods for simulating atmospheric corrosion, but most of them are limited to their respective environmental characteristics and geographical restrictions, such as those for heavily polluted industrial atmospheric environments and marine industrial environments.
However, there is no report on the test method for simulating the corrosion process of weathering steel in a high-humidity marine atmospheric environment.

Method used

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  • Method for simulating corrosion of weathering resistant steel in high-moist-heat marine atmosphere
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  • Method for simulating corrosion of weathering resistant steel in high-moist-heat marine atmosphere

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Embodiment 1

[0046] Adopt four kinds of weathering steel grades, carry out the method for simulating high-humidity marine atmospheric corrosion of the present invention, wherein 0# is contrast steel, is the common weathering steel that domestic certain steel factory produces, and 1#, 2# and 3# are experimental The material composition of the weathering steel smelted in the laboratory is shown in Table 1.

[0047] Table 14 Chemical composition of experimental weathering steel

[0048] steel C S P mn Si Cr Ni Cu Nb 0#(Q450NR1) 0.075 0.0068 0.012 0.80 0.39 0.50 0.19 0.24 0.035 1# 0.070 0.0045 0.0050 0.88 0.40 0.54 0.95 0.27 0.0046 2# 0.069 0.0058 0.0058 0.87 0.36 0.51 1.90 0.27 0.0033 3# 0.081 0.0058 0.0062 0.90 0.40 0.51 2.93 0.27 0.0038

[0049] Cut the sample weathering steel into small samples with a size of 60mm (length) × 40mm (width) × (3mm~5mm) (thickness), then deburr, clean and dry with hot air, and use...

Embodiment 2

[0053] Cut the four kinds of weathering steel test materials into small samples with the size of 150mm (length) × 75mm (width) × (3mm~5mm) (thickness), and then carry out deburring, cleaning and hot air drying, and use them first when cleaning. Gasoline or petroleum ether, then absolute ethanol, and finally acetone, then measure and record the original size (accurate to 0.1mm) and mass (accurate to 1mg) of the sample, and carry out the atmospheric exposure test. The exposure test standard refers to ISO-4524 It was carried out in a certain area of ​​the South China Sea. The test period is 2014.4-2015.4. The size of the exposure sample is 150mm (length) × 75mm (width) × (3mm ~ 5mm) (thickness), and the exposure period is 1 year. After the exposure test, the samples were processed, and the corrosion weight loss and phase analysis of the rust layer were carried out.

[0054] Figure 7 It is the histogram of the average corrosion rate of four kinds of samples in the field of emb...

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Abstract

The invention relates to a method for simulating corrosion of weathering resistant steel in high-moist-heat marine atmosphere. The method comprises the following test parameters that a weathering resistant steel test specimen is subjected to the circulation processes of steeping, moistening and drying in an alternate immersion corrosion testing machine; the circulation period is 60min+ / -5min; the steeping time is 2min+ / -1min; the moistening time is 10min+ / -2min; a dipping solution is a NaCl solution; the NaCl solution concentration is 2.00 percent+ / -0.05 percent; the steeping solution temperature is 35 DEG C+ / -2 DEG C; the humidity in the alternate immersion corrosion testing machine is 80 percent RH+ / -5 percent RH; the total corrosion time of the weathering resistant steel test specimen in the alternate immersion corrosion testing machine is greater than or equal to 72h; a baking lamp in the alternate immersion corrosion testing machine is kept open. The method has better simulation performance, acceleration performance and reproducibility, and provides bases for studying the corrosion rule and the corrosion resistance of the weathering resistant steel in high-moist-heat marine environment.

Description

technical field [0001] The invention relates to the technical field of simulating the corrosion process of weathering steel in the atmosphere, in particular to a method for simulating the corrosion of weathering steel in the high-humidity ocean atmosphere. Background technique [0002] Weathering steel has good atmospheric corrosion resistance due to the formation of a dense and continuous corrosion product layer on the surface during use, which can prevent further corrosion of the substrate by external oxygen, water and other corrosive media. Performance, at the same time, it has high corrosion resistance and excellent mechanical and welding performance. [0003] The field exposure test of materials is a common test method for studying atmospheric corrosion. This method can truly reflect the corrosion situation in the location and provide reliable test data basis for reasonable material selection in engineering construction. For this reason, my country has also established...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
CPCG01N17/006
Inventor 陈小平黄涛王向东汪兵
Owner CENT IRON & STEEL RES INST
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