Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (02): 156-160.doi: 10.3866/PKU.WHXB20020213

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Atmospheric Corrosion of A3 Steel with Deposited Ammonium Sulfate

Wan Ye;Yan Chuan-Wei;Qu Qing;Shi Zhi-Ming;Cao Chu-Nan   

  1. State Key Laboratory for Corrosion and Protection,Institute of Metal Research,Chinese Academy of Sciences,Shenyang　110016
  • Received:2001-07-23 Revised:2001-09-21 Published:2002-02-15
  • Contact: Wan Ye E-mail:yewan@icpm.syb.ac.cn

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Abstract: The atmospheric corrosion of A3 steel with deposited (NH4)2SO4 particles has been investigated at 298 K and relative humidity of (85±5)％.Corrosion kinetics curves show that A3 steel with deposited (NH4)2SO4 particles corroded more seriously than that without (NH4)2SO4 particles.IR,SEM/EDAX and XPS were utilized to study the development and characterization of corrosion products.The results indicate that A3 steels with (NH4)2SO4 particles corroded much faster than that without (NH4)2SO4 particles,and the corrosion of A3 steel initiated along the deposition area of (NH4)2SO4 particles,and formed basic iron sulfate.A corrosion mechanism was proposed to explain the observation.

Key words: A3 steel, (NH4)2SO4 particle, 　Deposition, Basic iron sulfate, Atmospheric corrosion