【Corrosion Technology Edition】Daily Question 20170718: What is high-temperature sulfidation corrosion?
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To increase the popularity of the Corrosion Technology section, foster communication among users, and enable mutual progress and improvement, the [One Question per Day] activity has been launched. Reward rules: 3 wealth points for replying, 10 wealth points for a correct answer. This topic is valid for two days; no scoring or rewards will be given after that. Term explanation: What is high-temperature sulfurization corrosion? The process in which metals react with sulfur-containing media at high temperatures to form sulfides is known as high-temperature sulfidation corrosion of metals. ============================ Event Promotion: Petrochemical Zone – “Creative Ideas for Energy Saving” event (the second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum) 2017 Coal Chemical Industry Event – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html (Source: Haichuan Chemical Industry Forum)
The process in which metals react with sulfur-containing media (such as H2S, SO2, Na2SO4, organic sulfides, etc.) at high temperatures to form sulfides is known as high-temperature sulfidation of metals.
High-temperature sulfur corrosion is known as sulfidation. The corrosion process that occurs when metals react with sulfur in high-temperature, sulfur-containing atmospheres to form metal sulfides is such that the sulfide film formed on the metal surface usually contains many defects; it is not dense enough and has poor adhesion, resulting in a weak protective effect on the base metal. Therefore, the rate of high-temperature sulfidation of metals is generally significantly higher than their rate of high-temperature oxidation
It refers to the corrosion caused by the reaction of metals with sulfur at high temperatures; it usually involves the high-temperature sulfidation of metals with gaseous sulfur or organic bases.
The corrosion process that occurs when metals react with sulfur in high-temperature, sulfur-containing atmospheres to form metal sulfides is such that the sulfide film formed on the metal surface usually contains many defects; it is not dense enough and has poor adhesion, resulting in a weak protective effect on the base metal. Therefore, the rate of high-temperature sulfidation of metals is generally significantly higher than their rate of high-temperature oxidation.
High-temperature sulfide corrosion of steel materials is a type of high-temperature corrosion problem that is commonly encountered in oil refining, petrochemical industries, thermal power generation, coal gasification and liquefaction, as well as various fuel furnaces. In principle, the sulfidation and oxidation of metals behave similarly in many aspects, but the sulfidation rate is generally one to two orders of magnitude higher than the oxidation rate; therefore, the sulfidation environment is much more demanding than a simple oxidation environment
The corrosion process that occurs when metals react with sulfur in a sulfur-containing atmosphere to form metal sulfides is such that the sulfide film formed on the metal surface usually contains many defects; it is not dense enough and has poor adhesion, resulting in a weak protective effect on the base metal. Therefore, the rate of high-temperature sulfidation of metals is generally significantly higher than their rate of high-temperature oxidation.
Firstly, hydrogen sulfide causes corrosion directly on the surface of carbon steel; corrosion is most severe at temperatures between 375–425°C. At the same time, at temperatures between 350–425°C, hydrogen sulfide can decompose into elemental sulfur, which leads to even more intense corrosion of carbon steel at high temperatures.
High-temperature sulfidation refers to the corrosion that occurs when metals react with sulfur at high temperatures. It usually involves metals reacting with gaseous sulfur or organic bases at high temperatures; for this process to take place, a reducing atmosphere is required, one in which the partial pressure of oxygen is very low while the partial pressure of sulfur is high. The rate of metal sulfidation reactions is much greater than that of oxidation reactions. Moreover, for most metals, sulfur is a more powerful and corrosive oxidizing agent, resulting in more severe sulfidation corrosion. In oxidizing sulfur-containing environments, although sulfide corrosion also occurs, the corrosion is primarily due to high-temperature oxidation.
High-temperature sulfurization corrosion: The high-temperature sulfur-containing process gases after combustion consist of H2S, SO2, sulfur vapor, CS2, COS, CO2, water vapor, nitrogen, and others. These media often cause corrosion in a combined form. When the temperature is above 310°C, carbon steel suffers from high-temperature sulfide corrosion!
High-temperature sulfur corrosion, hills tc}nleraturc sulfidation, is referred to as sulfidation. The corrosion process that occurs when metal reacts with sulfur in a high-sulfur atmosphere to form metal sulfides is such that the sulfide film formed on the metal surface usually contains many defects; it is not dense enough and has poor adhesion, resulting in a weak protective effect on the base metal. Therefore, the rate of high-temperature sulfidation of metals is generally significantly higher than their rate of high-temperature oxidation