Fig 1.
Corrosion morphology of CT after operation in Marine environment.
(a) A new CT (not used), (b) After use CT, (c) Appearance of CT after corrosion, (d) Corrosion cracking along the weld.
Fig 2.
(a)Standard tensile specimen dimension and (b) Physcal drawing of cutting position of sample.
Fig 3.
Standard tensile test samples of the WM and BM of CT.
(a) WM, (b) BM.
Table 1.
CT110 WM and BM chemical composition (mass fraction %).
Table 2.
Ion concentration of experimental reagent and drug.
Fig 4.
Main instruments of the experiment.
(a) High-temperature and high-pressure reactor, (b) Scanning electron microscope and (c) Electronic balance.
Fig 5.
MTS hydraulic universal testing machine.
Fig 6.
Comparison of macromorphology of sample surface before and after corrosion.
(a)WM morphology and (b)BM morphology before and after corrosion.
Fig 7.
The micro morphology of sample surface and EDS region energy spectrum analysis diagram after BM corrosion.
(a) Surface micro corrosion morphology, (b) Line scan of corrosion product elements on the surface and (c) Distribution of corrosion products on the surface.
Fig 8.
The micro morphology of sample surface and EDS region energy spectrum analysis diagram after WM corrosion.
(a) Surface micro corrosion morphology, (b) Line scan of corrosion product elements on the surface and (c) Distribution of corrosion products on the surface.
Table 3.
The analysis results of surface energy spectrum of CT BM and WM after corrosion.
Fig 9.
CT110 corrosion rate at different temperatures.
Fig 10.
CT110 corrosion rate at different CO2 partial pressure.
Fig 11.
Fracture morphology of sample after tensile test.
(a) Before corrosion and (b)After corrosion.
Fig 12.
CT110 WM and BM stress-strain curve before and after corrosion.
Table 4.
The comparison of mechanical properties of CT110 WM and BM before and after corrosion.