Analysis of corrosion behavior and mechanisms of economizer in yellow phosphorus tail gas boiler
In response to the corrosion problem of the economizer in yellow phosphorus tail gas boiler,the corrosion behavior of 316L stainless steel in a polyphosphoric acid environment is simulated,the surface morphology of 316L stainless steel,composition and structure of corrosion product after corrosion are analyzed.The results indicate that the corrosion rate of 316L stainless steel is influenced by temperature and polyphosphoric acid concentration,with an increase of corrosion rate under high temperature and low concentration conditions.The corrosion products mainly consist of elements such as P,Cr,Fe,Ca,Ni and Si,along with trace amounts of Al,S,Cl,Mn,Cu and Mo,contain MnO2,Fe(PO3)3,CrO3,Fe3(PO4)2,CaSO4,SiO2,Cr5O12,MoO2 and Ca(PO3)2.The corrosion mechanism involves the dissolution of elements from the metal substrate,formation of lattice defects,resulting in pitting corrosion,and the combination of P and O elements from the corrosion solution with metal elements to form corrosion products.
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