Medium simulation fluid and method of selecting steel for hydraulic support based on pitting resistance

Abstract

The invention relates to a medium simulation liquid and a method for selecting steel for hydraulic supports based on pitting resistance performance, belonging to the technical field of corrosion resistance detection of metal materials, and specifically relates to the selection of pitting corrosion resistance of hydraulic support materials for coal mine machinery. The present invention introduces a kind of comparative steel material, and processes the coal mine mechanical hydraulic support material and another comparative steel material into a test piece of a certain specification, and soaks the test piece in a specific corrosive medium simulation solution for 24 hours, and passes through Count and analyze the corrosion points on the test piece to evaluate the corrosion resistance of the coal mine machinery hydraulic support material. This method is fast and flexible, and the experimental cost is low.

Description

technical field [0001] The invention relates to the field of corrosion resistance detection of metal materials, in particular to a method for selecting steel for hydraulic supports of coal mine machinery based on the pitting resistance performance and the configuration of a medium simulation liquid. Background technique [0002] China is rich in coal resources, and modern machinery and equipment are mostly used in underground coal mining. Hydraulic support is a power device that uses liquid pressure to generate support force. There are some flammables in the underground coal mining environment, the liquid used in the hydraulic support is a water-based concentrate or emulsifier, and the water-based concentrate or emulsifier has a certain anti-corrosion effect on the inner wall of the support steel, while the actual coal mining During the process, some hydraulic supports were used for a period of time, and the inner wall in contact with the water-based concentrate or emulsifie...

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Problems solved by technology

For example, Chinese patent 200510029332.3 introduces the method of evaluating the pitting corrosion resistance of materials, introduces the repassivation temperature, adopts the standard three-electrode system electrochemically, and uses the corrosion current density-temperature cycle scanning method temperature under constant applied potential to measure the repassivation temperature of the material. Passivation and critical pitting temperature, this method needs to use electrochemical equipment, the cost of the experiment is high, the sample production is cumbersome, and the experiment period is relatively long (Jiang Yiming, Wu Weiwei, etc. A method for evaluating the pitting corrosion resistance of materials [P] .Chinese patent, 200510029332.3.2009-9-1.)

The standard GB / T18590-2001 of the People's Republic of China stipulates the pitting evaluation methods of metals and alloys, including microscope method, electromagnetic method, acoustic wave method, area method and other evaluation methods. The number of pits is counted by microscope to determine the pit density. The use of standard maps for ratings is complex and difficult to evaluate (GB / T18590-2001, Corrosion and pitting evaluation methods for metals and alloys.)

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