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The concentration of sulfuric acid corrosion of stainless steel                                                                                             Cai Chung Exceed Edited by
One.Objective:
          Stainless steel for most acid and alkali resistance, such as nitric acid and acetic acid, sulfuric acid was able to stainless steel caused by erosion, with the concentration of sulfuric acid for stainless steel has a different impact of erosion, the stainless steel of different composition are also differences, this is mainlydiscuss different concentrations of sulfuric acid for stainless steel 304 and 316L impact, and how to prevent sulfuric acid erosion of stainless steel.
 
        304: General Model; 18/8 stainless steel. The country of China signage 06Cr19Ni10, and to replace the previous 0Cr18Ni9. The standard components of the 18% of chromium plus 8% nickel. Can not be changed by the heat treatment method magnetic structure of stainless steel microstructure. (1)
       316L: 316L: 316 to 304, the second most widely used in steel species, mainly for the food industry and surgical equipment, adding molybdenum to obtain a corrosion resistant special structure. 18/10 stainless steel usually meet the application level. Special corrosive environment, ship assembly, building materials for the chemical, seaside. 316L-low carbon more corrosion. 316L stainless steel in a sulfuric acid concentration of less than 15% or greater than 85% of the normal? State, good corrosion resistance. At 80 degrees or more, have a certain? Volatility, its corrosion resistance is greatly decreased. 316L stainless steel in 45% dilute sulfuric acid medium corrosion resistance than? Poor, and again certain? Degree of fluctuation in the corrosion even worse.
Three.Sulfuric acid used in the industry:
          Sulfuric acid as a strong corrosive medium, sulfuric acid is a highly versatile industrial raw materials. But different concentrations and the temperature of sulfuric acid, corrosion of materials vary greatly, for a concentration of more than 85%, the temperature is less than 80 ° C, concentrated sulfuric acid, carbon steel and cast iron has a better corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid ; ordinary stainless steel, such as 304,316 sulfuric acid medium of limited use.Transporting sulfuric acid is usually high silicon cast iron, high alloy stainless steel. The fluorine plastic has good resistance to sulfuric performance Fluorine manufacturing is a more economical choice. Ceramic coating for testing, the results show good resistance to dilute sulfuric acid's ability to, but the high cost of ceramic cost, must be the consideration of cost.
Four.Conclusion:
 

      Concentrations ranged from 15-85% of the sulfuric acid solution, a high degree of erosion for the stainless steel, wherein 316L tolerated than 304, but will be eroded, temperature erosion has the effect of strengthening the learned information for Liningmanufacturing and ceramic cladding, but past experience fluorine will drop the inner layer of stainless steel erosion, ceramic has good ability of resist, but the cost will be a consideration of one.
Source:
(1)Wikipedia
http://zh.wikipedia.org/wiki/%E4%B8%8D%E9%8F%BD%E9%8B%BC

(2)Yahoo Blog
http://tw.myblog.yahoo.com/jw!PqicSU.fER.58omp8oo-/article?mid=69

(3)Baidu know
http://zhidao.baidu.com/question/230541560.html?fr=qrl& cid=985&index=4&fr2=query後段製程生產設備

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