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A Corrosion Resistance Evaluation Method of Low Alloy Steel Used in Polar Marine Environment

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

Active Publication Date: 2021-03-12
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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  • A Corrosion Resistance Evaluation Method of Low Alloy Steel Used in Polar Marine Environment
  • A Corrosion Resistance Evaluation Method of Low Alloy Steel Used in Polar Marine Environment
  • A Corrosion Resistance Evaluation Method of Low Alloy Steel Used in Polar Marine Environment

Examples

Experimental program
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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 a method for evaluating the corrosion resistance of low-alloy steel used in polar marine environments, which includes: placing a low-alloy steel sample in a corrosive liquid for processing, and observing the inclusion pitting corrosion of the sample in a microscope after the processing is completed The strength of the corrosion resistance of low-alloy steel used in the polar marine environment is determined by the number of pitting sources of inclusions; among them, the corrosion solution contains CuCl, SnCl 2 and FeCl 3 . The invention discloses a method for evaluating the corrosion resistance of steel used in the polar marine environment, which has simple steps, convenient operation and short experiment period, and is convenient for formulating metal material selection schemes for industries such as transportation equipment manufacturing and steel structure structure manufacturing in the polar marine 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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Patent Type & Authority Patents(China)
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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