TY - JOUR
T1 - Performance of cactus mucilage and brown seaweed extract as a steel corrosion inhibitor in chloride contaminated alkaline media
AU - Hernández, Eddisson Francisco
AU - Cano-Barrita, Prisciliano Felipe De Jesus
AU - León-Martínez, Frank Manuel
AU - Torres-Acosta, Andres Antonio
N1 - Publisher Copyright:
© Emerald Publishing Limited.
PY - 2017
Y1 - 2017
N2 - Purpose - This paper aims to present experimental results related to the performance of cactus mucilage (CM) and brown seaweed extracts (SEs) to inhibit reinforcing steel bar (rebar) corrosion in saturated calcium hydroxide alkaline solutions (pH = 12.5). Design/methodology/approach - Electrochemical cells were prepared using CM solutions at 0.5, 1 and 1.38 per cent concentration (w/v), SE solutions at 0.5, 1, 1.38, 2 and 3 per cent concentration (w/v), sodium alginate at 1 per cent concentration (w/v) and calcium nitrite at 11.3 per cent (v/v). Each cell contained six deformed reinforcing steel bars of 9.5 mm nominal diameter. The experiments were performed at 23 ± 2°C in two stages. The first stage was aimed at stabilizing the rebar until passivation was reached. The second stage included adding NaCl in six steps from 0.5 to 16 g/L. Half-cell potential, linear polarization resistance and electrochemical impedance spectroscopy measurements were monitored during both stages. Findings - The electrochemical test results indicated that both additions reduce the corrosion rate of rebars and pitting in an alkaline media with chloride ions (16 g/L NaCl). Electrochemical impedance spectroscopy results for rebars in natural-added solutions showed higher charge transfer resistance and double layer capacitance values, indicative of the formation of a second interface between the rebar and the electrolyte. Research limitations/implications - The information obtained was for alkaline solutions only. Further investigation is performed using concrete as the alkaline electrolyte. Practical implications - CM and SE may be suitable low-cost corrosion inhibitors for steel in concrete. Social implications - The use of botanical or algae products for this application will encourage people to consider its production for this particular application. Also, the possible harvest in an environmental friendly way will diminish in the future the use of biohazards and toxic inhibitors. Originality/value - This investigation is a continuation of a one presented in 2007, which uses only nopal mucilage. This new investigation corroborates what was concluded in the early investigation and incorporates a new natural by product, algae, as a possible corrosion inhibitor product.
AB - Purpose - This paper aims to present experimental results related to the performance of cactus mucilage (CM) and brown seaweed extracts (SEs) to inhibit reinforcing steel bar (rebar) corrosion in saturated calcium hydroxide alkaline solutions (pH = 12.5). Design/methodology/approach - Electrochemical cells were prepared using CM solutions at 0.5, 1 and 1.38 per cent concentration (w/v), SE solutions at 0.5, 1, 1.38, 2 and 3 per cent concentration (w/v), sodium alginate at 1 per cent concentration (w/v) and calcium nitrite at 11.3 per cent (v/v). Each cell contained six deformed reinforcing steel bars of 9.5 mm nominal diameter. The experiments were performed at 23 ± 2°C in two stages. The first stage was aimed at stabilizing the rebar until passivation was reached. The second stage included adding NaCl in six steps from 0.5 to 16 g/L. Half-cell potential, linear polarization resistance and electrochemical impedance spectroscopy measurements were monitored during both stages. Findings - The electrochemical test results indicated that both additions reduce the corrosion rate of rebars and pitting in an alkaline media with chloride ions (16 g/L NaCl). Electrochemical impedance spectroscopy results for rebars in natural-added solutions showed higher charge transfer resistance and double layer capacitance values, indicative of the formation of a second interface between the rebar and the electrolyte. Research limitations/implications - The information obtained was for alkaline solutions only. Further investigation is performed using concrete as the alkaline electrolyte. Practical implications - CM and SE may be suitable low-cost corrosion inhibitors for steel in concrete. Social implications - The use of botanical or algae products for this application will encourage people to consider its production for this particular application. Also, the possible harvest in an environmental friendly way will diminish in the future the use of biohazards and toxic inhibitors. Originality/value - This investigation is a continuation of a one presented in 2007, which uses only nopal mucilage. This new investigation corroborates what was concluded in the early investigation and incorporates a new natural by product, algae, as a possible corrosion inhibitor product.
KW - Buildings and/or civil structures
KW - Cactus mucilage
KW - Inhibitors
KW - Reinforcing steel
KW - Seaweed extract
UR - http://www.scopus.com/inward/record.url?scp=85029894449&partnerID=8YFLogxK
U2 - 10.1108/ACMM-02-2016-1646
DO - 10.1108/ACMM-02-2016-1646
M3 - Artículo
SN - 0003-5599
VL - 64
SP - 529
EP - 539
JO - Anti-Corrosion Methods and Materials
JF - Anti-Corrosion Methods and Materials
IS - 5
ER -