New Triazole and Isoxazole Compounds as Corrosion Inhibitors for Cu-Ni (90/10) Alloy and Galvanized Steel Substrates
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M.A. DOMI´NGUEZ-CRESPO and A.M. TORRES-HUERTA are with the Instituto Polite´cnico Nacional, CICATA-Altamira, km 14.5 Carretera Tampico-Puerto Industrial Altamira, C.P. 89600 Altamira, Tamps, Mexico and also with the Instituto Polite´cnico Nacional, UPIIH, Ciudad del conocimiento y la cultura, Carretera Pachuca-Actopan km 1+500, San Agustin Tlaxiaca, Hidalgo, Mexico. Contact email: [email protected] L. GERARDO ZEPEDA-VALLEJO is with the Instituto Polite´cnico Nacional, ENCB, Departamento de Quı´ mica Orga´nica, Mexico City 11340, Mexico. S.B. BRACHETTI-SIBAJA is with the Tecnolo´gico Nacional de Me´xico, IT de Ciudad Madero, D.E.P.I., Ave Primero de Mayo S.N. Col. Los Mangos, C.P. 89449 Ciudad Madero, Tamps, Mexico. D. PALMA-RAMI´REZ is with the Instituto Polite´cnico Nacional, CICATA-Altamira, and the Instituto Polite´cnico Nacional, CMP+L, Av. Acueducto s/n, la Laguna Ticoma´n, C.P. 07340 Mexico City, Mexico. A.E. RODRI´GUEZ-SALAZAR is with the Instituto Polite´cnico Nacional, Centro de Investigacio´n en Ciencia Aplicada y Tecnologı´ a Avanzada Unidad-Quere´taro, Cerro Blanco No. 141 Col. Colinas del Cimatario, C.P. 76090, Quere´taro, Quere´taro, Mexico. D.E. ONTIVEROS-DE LA TORRE is with the Instituto Polite´cnico Nacional, CICATA-Altamira, km 14.5 Carretera Tampico-Puerto Industrial Altamira, C.P. 89600 Altamira, Tamps, Mexico. Manuscript submitted May 22, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS A
INTRODUCTION
WATER cooling systems are one of the most essential parts of many industrial processes,[1] which mainly consist of a cooler network, pumping system, and cooling tower.[2] Particularly, the heat absorbed by the cooling water from a cooling tower process is eliminated through evaporation by releasing it into the atmosphere. During this step, the dissolved constituents of recirculation water become concentrated.[3] For this reason, a new quantity of water (make-up water) must be added into the tower in order to maintain the concentration cycle at a desired state. It is well known that service life and functionality of cooling system equipment are principally dependent of an adequate materials selection[4] and water quality.[5] In the first case, the cooling systems can be constructed by combining concrete with different metallic substrates, including carbon steel, stainless steel, galvanized steel, copper, and copper alloys, which are selected depending on their mechanical properties and corrosion resistance.[6–10] Additionally, different internal arrangements combined with other materials, such as poly(ethylene
terephthalate) or coconut fibers, have been proposed to improve stability and performance.[10] On the contrary, the water requirements need to be defined and they are usually taken from different sources: surface water, underground water, well water, seawater, wastewater, or effluents after treatments.[11–17] The water recirculation, by itself, and the sunlight exposure provide optimal conditions to induce the microbiological corrosion provoked by pathogenic microorganisms.[18–20] Several mo
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