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Evaluation method for corrosion resistance of low-alloy steel for polar region ocean environment

A low-alloy steel and marine environment technology, applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problems of long experimental period and inconvenient rapid screening of corrosion-resistant steel, etc., to achieve short experimental period and variety The effect of less and simple experimental process

Active Publication Date: 2019-01-11
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These similar methods can be used to study the influence of inclusions on pitting corrosion resistance, but the disadvantage of this type of method is that the experimental period is relatively long, and it can only evaluate the pitting corrosion resistance of one material relative to another material, which is not convenient Quick screening of qualified corrosion-resistant steel

Method used

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  • Evaluation method for corrosion resistance of low-alloy steel for polar region ocean environment
  • Evaluation method for corrosion resistance of low-alloy steel for polar region ocean environment
  • Evaluation method for corrosion resistance of low-alloy steel for polar region ocean environment

Examples

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Effect test

Embodiment 1

[0028] The ordinary ship plate steel AH36 is sampled along the rolling direction, processed into a metallographic sample, polished on 180#, 400#, 600#, 800#, 1200# sandpaper by the cross method, and polished on a grinding and polishing machine . Measure 500mL of deionized water and 500mL of absolute ethanol, mix them well, measure 45-55mL of hydrochloric acid (mass fraction 37%) with a density of 1.19g / ml and add it to the mixture, add 0.8g of CuCl, 0.4g of SnCl 2 , 28g of FeCl 3 , stirred, and the corrosion solution was obtained after all the solution was dissolved. Immerse the polished surface of the sample in the prepared corrosion solution, the temperature of the corrosion solution is 25°C, and the treatment time is 8 seconds. Take out the sample and rinse it with deionized water, and dry the sample quickly with a hair dryer. The sample is observed under a metallographic microscope, magnified 100 times, and the number of pitting sources of inclusions is counted. Take t...

Embodiment 2

[0030] The steel grade 1 (AH36) of the special smelting method was sampled along the rolling direction, processed into a metallographic sample, and polished on 180#, 400#, 600#, 800#, 1200# sandpaper in the cross method, and Polish on a grinder. Measure 500mL of deionized water and 500mL of absolute ethanol, mix them well, measure 45-55mL of hydrochloric acid (mass fraction 37%) with a density of 1.19g / ml and add it to the mixture, add 0.8g of CuCl, 0.4g of SnCl 2 , 28g of FeCl 3 , stirred, and the corrosion solution was obtained after all the solution was dissolved. Immerse the polished surface of the sample in the prepared corrosion solution, the temperature of the corrosion solution is 25°C, and the time is 8 seconds. Take out the sample and rinse it with deionized water, and dry the sample quickly with a hair dryer. The sample is observed under a metallographic microscope, magnified 100 times, and the number of pitting sources of inclusions is counted. The field of vie...

Embodiment 3

[0032] The steel type 2 (AH36) of the special smelting method is sampled along the rolling direction, processed into a metallographic sample, and polished on 180#, 400#, 600#, 800#, 1200# sandpaper in the cross method, and Polish on a grinder. Measure 500mL of deionized water and 500mL of absolute ethanol, mix them well, measure 45-55mL of hydrochloric acid (mass fraction 37%) with a density of 1.19g / ml and add it to the mixture, add 0.8g of CuCl, 0.4g of SnCl 2 , 28g of FeCl 3, stirred, and the corrosion solution was obtained after all the solution was dissolved. Immerse the polished surface of the sample in the prepared corrosion solution, the temperature of the corrosion solution is 25°C, and the time is 8 seconds. Take out the sample and rinse it with deionized water, and dry the sample quickly with a hair dryer. The sample is observed under a metallographic microscope, magnified 100 times, and the number of pitting sources of inclusions is counted. The field of view w...

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Abstract

The invention discloses an evaluation method for the corrosion resistance of low-alloy steel for a polar region ocean environment. The evaluation method comprises the following steps: putting a low-alloy steel test sample into a corrosion solution and treating; after the treatment is finished, observing the quantity of inclusion point corrosion sources in a microscope, and judging the strength ofthe corrosion resistance of the low-alloy steel for the polar region ocean environment according to the quantity of the inclusion point corrosion sources, wherein the corrosion solution contains CuCl,SnCl2 and FeCl3. The invention further discloses an evaluation method for the corrosion resistance of steel for the polar region ocean environment; the evaluation method is simple in steps, convenient to operate and short in experiment periods; and a metal material selection scheme is conveniently formulated for industries of transportation equipment manufacturing, steel-structure building manufacturing and the like in the polar region ocean environment.

Description

technical field [0001] The invention relates to a method for evaluating the corrosion resistance of low-alloy steel used in polar marine environments, and relates to the field of test and evaluation of metal materials, in particular to the field of evaluation of pitting corrosion resistance of metal materials. Background technique [0002] As people pay more attention to the development of marine resources, more and more offshore platforms and new marine transportation equipment have emerged as the times require. However, many steel structure facilities and equipment have been scrapped due to corrosion problems that have not reached the designed service life. Therefore, economical and practical Corrosion-resistant materials in marine environments have attracted attention. Stainless steel, nickel alloy, titanium alloy and other corrosion-resistant metal materials cannot be widely used in the marine environment due to their high price, so how to improve the corrosion resistanc...

Claims

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Application Information

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IPC IPC(8): G01N17/00
CPCG01N17/006
Inventor 蔡佳兴范益李强陈林恒代芹芹
Owner NANJING IRON & STEEL CO LTD
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