Characterization of Corrosion Products on Carbon Steel Exposed to Natural Weathering and to Accelerated Corrosion Tests

Table 2

Mössbauer parameters of the specimens exposed for nine months at Cubatão and Paula Souza and to four cycles of the accelerated tests, A and B.

	IS^a·(mm.s^−1)	QS· (mm.s^−1)	Hf (kOe)	Area occupied by phase (%)	Phases
Cubatão	0.39; 0.22	0.62; −0.18	—; 324	86.4; 13.6	𝛾-FeOOH; 𝛼-FeOOH
Paula Souza	0.38	0.60	—	100	𝛾-FeOOH
Test A	0.36; 0.37; 0.28; 0.46	0.59; −0.24; 0.08; −0.48	—; 451; 493; 355	12.0; 72.6; 15.4	𝛾-FeOOH; Fe3O4; 𝛼-FeOOH
Test B	0.39; 0.58; 0.29; 0.36	0.62; −0.26; 0.06; −0.35	—; 456; 493; 356	22.3; 55.4; 22.3	𝛾-FeOOH/𝛽-FeOOH; Fe3O4; 𝛼-FeOOH

aThe isomer shift values are given related to the Fe-𝛼.