PSI - Issue 54

Ana Dantas et al. / Procedia Structural Integrity 54 (2024) 593–600

597

AnaDantas / Structural Integrity Procedia 00 (2023) 000–000

5

Fig. 2: SolidWorks CAD assembly of the support system for quasi-static tensile specimens, with indication of its di ff erent elements.

set in relation to the open circuit potential ( E oc = − 6 . 59 x 10 − 1 ), as to obtain the anodic and cathodic branches of the polarization curve. The starting potential of the scan was set as -0.3 mV vs E oc and the ending potential was set to + 0.3mVvs E oc . The scan rate was set as 1 mV / s and the step size as 0.5 mV (Gamry Instruments, 2023).

-0.3

-0.4

= 0.000138229 A/cm 2

i

-0.5

corr

E

= -0.6938 V

corr

-0.6

-0.7

-0.8

-0.9

-1

-7

-6

-5

-4

-3

-2

-1

10

10

10

10

10

10

10

Fig. 3: Polarization curve of S690QL steel in a 3.5 %NaCl solution environment.

The mass loss correspondent to half an year of corrosion, without artificial acceleration, was determined by appli cation of Equation 2, based on Faraday’s law of electrolysis (ASTM International, 2015; Kutz, 2012).

( AM ) I corr t nF

∆ m 1 =

(2)

where:

• I corr [A] is the corrosion current; • F is the Faraday’s constant (F = 96485C / mol);

• AM [g / mol] is the Atomic mass; • n is the number of electrons lost.