Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (8): 995-1006.DOI: 10.1007/s40195-018-0853-y
Special Issue: 2019年腐蚀专辑-1
• Orginal Article • Previous Articles Next Articles
Miao-Ran Liu1,2, Xiao Lu1,3, Qi Yin1,3, Chen Pan1, Chuan Wang1(), Zhen-Yao Wang1()
Received:
2018-08-16
Revised:
2018-10-12
Online:
2019-08-10
Published:
2019-07-08
Miao-Ran Liu, Xiao Lu, Qi Yin, Chen Pan, Chuan Wang, Zhen-Yao Wang. Effect of Acidified Aerosols on Initial Corrosion Behavior of Q235 Carbon Steel[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(8): 995-1006.
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Steel | C | Si | Mn | P | S | Fe |
---|---|---|---|---|---|---|
Q235 | 0.14 | 0.01 | 0.33 | 0.011 | 0.02 | Bal. |
Table 1 Chemical compositions of Q235 (wt%)
Steel | C | Si | Mn | P | S | Fe |
---|---|---|---|---|---|---|
Q235 | 0.14 | 0.01 | 0.33 | 0.011 | 0.02 | Bal. |
Base solution | Acidifier | \(C_{{{\text{Cl}}^{ - } }}\) (mol/L) | pH | \(C_{{{\text{SO}}_{ 4}^{{ 2 { - }}} }}\) (mol/L) |
---|---|---|---|---|
NaCl | - | 0.6 | 5.5-6.0 | - |
NaCl | HCl | 0.6 | 1/2/3 | - |
NaCl | H2SO4 | 0.6 | 1/2/3 | 5?×?10-2/5?×?10-3/5?×?10-4 |
NaCl | Na2SO4?+?HCl | 0.6 | 1/2/3 | 5?×?10-2/5?×?10-3/5?×?10-4 |
NaCl | Na2SO4?+?HCl | 0.6 | 1 | 5?×?10-2/5?×?10-3/5?×?10-4 |
NaCl | Na2SO4?+?HCl | 0.6 | 2 | 5?×?10-2, 0.6 |
NaCl | Na2SO4?+?HCl | 0.6 | 3 | 5?×?10-2, 0.6 |
Table 2 Solution used in the experiment with different pH and concentrations of SO42- (\(C_{{{\text{Cl}}^{ - } }}\): concentration of Cl-; \(C_{{{\text{SO}}_{ 4}^{{ 2 { - }}} }}\): concentration of SO42-)
Base solution | Acidifier | \(C_{{{\text{Cl}}^{ - } }}\) (mol/L) | pH | \(C_{{{\text{SO}}_{ 4}^{{ 2 { - }}} }}\) (mol/L) |
---|---|---|---|---|
NaCl | - | 0.6 | 5.5-6.0 | - |
NaCl | HCl | 0.6 | 1/2/3 | - |
NaCl | H2SO4 | 0.6 | 1/2/3 | 5?×?10-2/5?×?10-3/5?×?10-4 |
NaCl | Na2SO4?+?HCl | 0.6 | 1/2/3 | 5?×?10-2/5?×?10-3/5?×?10-4 |
NaCl | Na2SO4?+?HCl | 0.6 | 1 | 5?×?10-2/5?×?10-3/5?×?10-4 |
NaCl | Na2SO4?+?HCl | 0.6 | 2 | 5?×?10-2, 0.6 |
NaCl | Na2SO4?+?HCl | 0.6 | 3 | 5?×?10-2, 0.6 |
Fig. 7 Morphologies of corrosion pits after removal of corrosion products under droplets: a acidified by H2SO4 with pH?=?1; b acidified by H2SO4 with pH?=?2; c acidified by HCl with pH?=?1; d acidified by HCl with pH?=?2
Fig. 12 Schematic diagram of formation process of ridge-like morphology under droplet acidified by H2SO4: a anode and cathode formed under droplet. Na+ and Fen+ migrated to the cathode area; Cl- and SO42- moved toward the anode area; b radial segregation of Cl- in the periphery of the droplet. The segregation area acted as local anode and corrosion products deposited on the accumulation area firstly; c a raised irregular corrosion products ring formed in the end of radial corrosion products. The raised corrosion products will absorb more water and Cl-; d one or several weak points in raised corrosion products acted as anode forming a severe corrosion point
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