Ambient temperature impact on Spontaneous combustion of Iron sulfur compoundsChen long songChemistry and Chemical EngineeringAbstractIn recent years，accidents of refining， storage and transport equipment leak always occur because of sulfur corrosion，and that bring enterprises big economic loss，based on analysis on accident we found，spontaneous combustion of Iron sulfur compounds is the main cause of To make a observation on oxide bias of oxides of iron sulfide product in different ambient temperature 15℃，25℃，50℃，75℃To make a theoretical analysis on the principle of burning oil caused by Iron sulfur compounds form and oxides of iron sulfide product，to make a systematic and deep experimental study on dynamic changes in process of oxidation of iron sulfide product and factos impact on oxide bias of Iron sulfur compounds ，and then link oil processing and storage-transport process in practical situation to make analysis and disscusion on factors impact on oxidation rate ，we draw oxidation temperature curve of sulfide product in differen Experiment facts show:as ambient temperature icreases ，more chemical reaction between Fe2O3 and H2S occur which produce more sulfide product with higher activity，and when surface structure of sulfide product turn more active，sulfide product of Fe2O3 oxide bias will also be Key words :Storage tanks， curing temperature， sulfur compounds iron ，oxide bias
我是手翻的 304 stainless steel is the most commonly used types of austenitic stainless steel one， and in a wide range of domestic applications， the advantage of high corrosion resistance， wear resistance and beautiful appearance， excellent processing and forming properties of hot and cold， has a good welding performance， excellent low temperature performance characteristics Study at different temperatures after solution treatment on its corrosion resistance， corrosion occurred in the law revealed in guiding the use of 304 stainless steel heat treatment process prior to the formulation and application of materials is very In this paper， respectively， of the 304 stainless steel were 850 ℃， 1000 ℃ and 1100 ℃ solution treatment， observation of its microstructure， and the results of an analysis of polarization curves of 304 stainless steel heat treatment process the impact of corrosion Get the following conclusions: (1) 304 stainless steel after solution treatment， after the main purpose is to enable organizations austenite so that the carbide matrix dissolution， lack of solution treatment temperature， carbon can not be fully dissolved in the matrix， resulting in carbon and chromium in steel Cr23C6 high-chromium carbide， resulting in partial depleted of chromium to steel corrosion resistance drop solution treatment temperature is too high will变粗large austenite grains， resulting in uneven steel， so that decline in its mechanical (2) at room temperature， 5% NaOH in the corrosive environment， the 304 stainless steel corrosion resistance (3) The experimental results show that: After 1000 ℃ specimen after solution treatment the best corrosion 304不锈钢是最常用的奥氏体不锈钢种之一，且在国内应用十分广泛，其优点是具有较高的耐蚀、耐磨和精美外观，具有优良的冷热加工和成型性能，具有良好的焊接性能、低温性能较好等优良特性。研究不同温度下的固溶处理后对其耐腐蚀性能的影响，揭示腐蚀发生的规律，对指导304不锈钢使用前的热处理工艺的制定以及材料的应用范围有着十分重要的意义。 本文主要对304不锈钢分别进行了850℃、1000℃和1100℃固溶处理，观察了其显微组织，并通过极化曲线结果分析了热处理工艺对304不锈钢耐蚀性能的影响。得到以下结论： （1）304不锈钢经过固溶处理后的主要目的是使组织奥氏体化，使基体内的碳化物溶解，固溶处理温度不足，碳化物不能充分溶解于基体，造成碳与钢中的铬形成高铬的Cr23C6型碳化物，导致局部铬的贫化，使其钢的耐腐蚀性能下降，固溶处理温度过高又会是奥氏体晶粒变粗大，造成钢的组织不均匀，使其机械性能下降。 （2）室温下，在5%NaOH腐蚀环境下，304不锈钢的耐腐蚀性能发生了变化。 （3）实验结果表明：经过1000℃固溶处理后的试样的耐蚀性能最好。
