Study On The Risk Of Corrosion Failure Of Pipes In The Process Of Mine Salt Mining And Brine Transportation

With the rapid development of the mine salt industry,the demand for brine resources is also increasing.In the process of mine salt mining,the corrosion safety of pipes is a major technical challenge.Once the pipeline is corroded and perforated,the bri ne will leak,which will cause huge economic losses and serious environmental pollution problems.To ensure the safe production and smooth operation of pipeline engineering,it is necessary to optimize the design and selection of the materials for the halogen transportation pipeline.Over the years,the salt chemical industry has been actively researching,developing and applying new anti-corrosion materials and equipment to create long-term safe production conditions.In this paper,three kinds of stainles s steel materials with increasing cost performance are selected as alternative materials for carbon steel,which are commonly used materials for mine salt mining and brine pipelines,and different experimental programs are designed to study the effects of carbon steel and three stainless steel materials in high-concentration sodium chloride solutions.The law of corrosion behavior.The main research content and conclusions are as follows:(1)According to the difference of sodium chloride content in the process of salt mining and brine transportation,the experiment uses sodium chloride to prepare brine simulation solution,with a concentration of 15%as the intermediate gradient,at 70 ?,using corrosion coupons to carbon Steel,304,316 L,and 2205 duplex steel were subjected to static corrosion experiments.The experiment showed that the average corrosion rate of the four materials was 2205 duplex steel<316L stainless steel<304 stainless steel<carbon steel,and the average corrosion rate of carbon steel m aterial was 2205 Nearly 20 times that of dual-phase steel.(2)In a 15% brine simulation solution,use corrosion coupons to conduct static corrosion experiments on carbon steel,304,316 L,and 2205 duplex steel at different temperatures,with 70°C as the intermediate temperature,and set the control group in a normal temperature environment,To study the influence of different temperatures on the corrosion behavior of metal materials.Experiments show that the higher the temperature,the more serious the corrosion of carbon steel,and the stainless steel material is less affected by the temperature than the carbon steel material,and the 2205 duplex steel shows much higher pitting corrosion resistance than other materials.(3)According to the flow rate r ange of the brine in the pipeline,a stirrer is used in the laboratory to simulate the brine flow environment,and the corrosion coupons are used to perform room temperature testing of carbon steel,304,316 L,and 2205 dual-phase steel in a 15% concentrati on brine simulation solution.Dynamic corrosion experiment.The results show that the erosion and corrosion resistance of carbon steel in the state of solution flow is much lower than that of 2205 dual-phase steel.(4)Combining common safety assessment m ethods in chemical long-distance pipeline engineering,a safety assessment method based on corrosion rate prediction suitable for mine salt mining and brine pipelines is introduced.At the same time,a combination of experiment and mathematical analysis is used,and the design-expert numerical analysis software is used to verify the results of the dynamic corrosion experiment,which further proves that the 2205 dual-phase steel material is more suitable for use in mine salt mining and brine transportation p rojects.At the same time,the complete corrosion failure time of carbon steel,304,316 L,and 2205 dual-phase steel pipelines is calculated,which provides a reference for predicting the safe operation of materials.