Managing corrosion in desalination plants

Abstract

Environment quality, clean energy and worldwide water scarcity have been established today as central disciplines in modern science, engineering and technology. The innovative desalination technology of saline water (SW) contributes to alleviate these problems by producing fresh water from SW, mainly seawater and brackish water. Desalination plants (DPs) have a high level of corrosion risk as they handle and process aggressive SW under severe operating conditions, which include filtration, heat exchange, distillation, evaporation, agitation and circulation and high flow velocities, often turbulent. These SW, that is, sea, brackish and brines, cause localized corrosion such as pitting, crevice, galvanic and stress corrosion. In addition, biological fouling and mineral scaling are frequent nuisances that alter the equipment surface performance and induce corrosion. Two main technologies are used to obtain potable water and a brine for disposal: thermal evaporation and membrane separation, called reverse osmosis. The main way to minimize corrosion is the correct selection of corrosion-resistant materials for the fabrication of DP equipment, structures, installations and machinery. To protect the DP materials, industrial paints, polymeric coatings and rubber linings compatible with the DP fluids are applied. Cathodic protection with sacrificial anodic metals and/or impressed direct electrical current and corrosion inhibitors are supplied.

Prospecção tecnológica em sistemas de dessalinização da água salobra e salgada

“…A salmoura, resíduo com alta carga de sais, é o principal componente gerado e constitui quase a metade do volume de água dessalinizada (JONES et al, 2019). Os equipamentos utilizados nas usinas de dessalinização sofrem corrosão devido ao fluxo da água, à natureza corrosiva dos sais e à temperatura elevada (SCHORR et al, 2019). Para minimizar os efeitos da corrosão nos equipamentos, são usados compostos químicos, tais como a hidrazina, íons de hipoclorito e o sulfito de sódio (DARWISH; HASSABOU; SHOMAR, 2013).…”

Inhibition of corrosion of mild steel hull plates immersed in natural sea water by sandalwood oil extract of some natural products

“…It is essential to protect them from corrosion. Several corrosion inhibitors have been used to control corrosion of metals and alloys in sea water [1][2][3][4][5][6][7][8][9][10].…”

“…Managing corrosion in desalination plants has been discussed by Schorr et al To protect the desalination plant (DP) materials, industrial paints, polymeric coatings and rubber linings compatible with the DP fluids are applied. Cathodic protection with sacrificial anodic metals or impressed direct electrical current and corrosion inhibitors are supplied [4]. In marine conditions, especially in the Arctic, the problems of reliability and safety of marine corrosion protection systems are relevant.…”

Influence of a paint coating on the corrosion of hull plates made of mild steel in natural seawater

“…Managing corrosion in desalination plants has been discussed by Schorr et al To protect the desalination plant (DP) materials, industrial paints, polymeric coatings and rubber linings compatible with the DP fluids are applied. Cathodic protection with sacrificial anodic metals or impressed direct electrical current and corrosion inhibitors are supplied [4]. Corrosion studies of zinc coated steel parts in seawater have been made by Karthikeyan and Jeeva [5].…”