Evaluation of Microbiological Corrosion of API 5L X80 Steel by Electrochemical Techniques in Produced Water by the Oil Industry

Oliveira, Edkarlla Sousa Dantas de; Pereira, Roseana Florentino da Costa; Lima, Maria Alice Gomes de Andrade; Urtiga Filho, Severino Leopoldino

doi:10.1590/1980-5373-MR-2019-0525

Edkarlla Sousa Dantas de Oliveira ^**e-mail: edkarllaquimica@hotmail.com

Universidade Federal de Pernambuco, Departamento de Engenharia Mecânica, Av. Prof. Moraes Rego, 1235, Cidade Universitária, 50670-901, Recife, PE, Brasil

http://orcid.org/0000-0001-7636-9961

Roseana Florentino da Costa Pereira

Universidade Federal de Pernambuco, Departamento de Engenharia Mecânica, Av. Prof. Moraes Rego, 1235, Cidade Universitária, 50670-901, Recife, PE, Brasil

http://orcid.org/0000-0001-9668-0677

Maria Alice Gomes de Andrade Lima

Universidade Federal de Pernambuco, Departamento de Engenharia Química, Av. Prof. Arthur Sá s/n, Cidade Universitária, 50740-521, Recife, PE, Brasil

Severino Leopoldino Urtiga Filho

Universidade Federal de Pernambuco, Departamento de Engenharia Mecânica, Av. Prof. Moraes Rego, 1235, Cidade Universitária, 50670-901, Recife, PE, Brasil

*e-mail: edkarllaquimica@hotmail.com

Parameters	pH	SO₄^-2 (mg/L)	S^-2 (mg/L)	NO₃^-(mg/L)	Cl^- (mg/L)	Salinity (mg/L)	Fe (mg/L)	Oil and grease (mg/L)	TDS^(a) (a) Total Dissolved Solids; (mg/L)	TSS^(b) (a) Total Dissolved Solids; (mg/L)
Results	6.8	230.0	0.6	0.4	56.2	88.7	5.7	79.0	76.8	239.0

Groups of microorganisms	Total aerobic	Total anaerobic	Acid-producing aerobic	Acid-producing anaerobic	Precipitating iron bacteria	Sulfate-reducing bacteria
Cell concentration	1.2 x 10⁴ (CFU/mL)	1.1 x 10³ (MPN/mL)	7.0 x 10 (MPN/mL)	2.5 x 10² (MPN/mL)	Undetected	4.5 x 10³ (MPN/mL)

Time (h)	R_s (Ω cm²)	R_ct (Ω cm²)	Y_ct (Ω^-1 cm^-2 s^-n)	n_ct
24	5.12	1.16 x 10³	481 x 10^-6	0.435
48	6.10	1.32 x 10³	148 x 10^-6	0.359
72	4.95	2.61 x 10³	672 x 10^-6	0.783
192	7.21	1.29 x 10³	4.86 x 10^-3	0.414
360	4.82	1.44 x 10³	3.11 x 10^-3	0.432
720	1.75	1.88 x 10³	4.22 x 10^-3	0.774
1080	9.87	1.37 x 103	1.49 x 10^-3	0.589
1440	3.75	3.32 x 103	1.68 x 10^-3	0.298

Time (h)	R_s (Ω cm²)	R_f (Ω cm²)	Y_f (Ω^-1 cm^-2 s^-n)	n_f	R_ct (Ω cm²)	Y_ct (Ω^-1 cm^-2 s^-n)	n_ct
24	3.22	1.96 x 10³	155 x 10^-6	0.864	1.58 x 10³	430 x 10^-6	0.250
48	3.78	2.47 x 10³	189 x 10^-6	0.857	1.60 x 10³	192 x 10^-6	0.347
72	3.96	2.79 x 10³	111 x 10^-6	0.671	1.76 x 10³	159 x 10^-6	0.895
192	4.68	5.15 x 10³	690 x 10^-6	0.754	2.13 x 10³	387 x 10^-6	0.435
360	4.01	5.51 x 10³	181 x 10^-6	0.967	2.25 x 10³	852 x 10^-6	0.732
720	6.08	6.08 x 10³	794 x 10^-6	0.837	3.39 x 10³	1.84 x 10^-3	0.741
1080	7.67	5.63 x 10³	1.15 x 10^-3	0.824	3.19 x 10³	3.14 x 10^-3	0.685
1440	4.06	6.19 x 10³	3.58 x 10^-3	0.725	4.57 x 10³	4.59 x 10^-3	0.812

Time (h)	R_s (Ω cm²)	R_b (Ω cm²)	Y_b (Ω^-1 cm^-2 s^-n)	n_b	R_ct (Ω cm²)	Y_ct (Ω^-1 cm^-2 s^-n)	n_ct
24	1.88	3.97 x 10³	282 x 10^-6	0.871	3.05 x 10³	695 x 10^-6	0.811
48	2.67	2.54 x 10³	260 x 10^-6	0.873	2.81 x 10³	2.45 x 10^-3	0.374
72	2.42	2.19 x 10³	340 x 10^-6	0.905	2.63 x 10³	2.73 x 10^-3	0.462
192	2.46	4.27 x 10³	370 x 10^-6	0.933	3.17 x 10³	742 x 10^-6	0.705
360	2.56	4.91 x 10³	928 x 10^-6	0.879	3.31 x 10³	1.02 x 10^-3	0.243
720	2.41	7.62 x 10³	1.60 x 10^-3	0.915	6.34 x 10³	1.52 x 10^-3	0.719
1080	3.23	6.27 x 10³	3.15 x 10^-3	0.831	4.08 x 10³	2.44 x 10^-3	0.748
1440	2.22	7.11 x 10³	2.15 x 10^-3	0.908	6.12 x 10³	1.56 x 10^-3	0.597

[1] *e-mail: edkarllaquimica@hotmail.com