Clarifiers are utilized by various chemical process plants, including the pulp and paper industry. Clarifiers are used to minimize the amount and toxicity of suspended solids in the effluent stream. The clarification process incorporates coagulation, flocculation, and sedimentation. The removal of suspended matter by settling […]
Reverse current electrolysis switches have been used for many years to minimize stray current corrosion damage to underground metallic structures. Various types of systems have been utilized with varying electronics industry has come of age resulting in new, more reliable, higher power devices for the […]
To date the majority of cathodic protection systems utilize either sacrificial anode or impressed current systems relying upon AC to DC rectifiers powered from the conventional electric power grid. In remote locations however, many alternative energy sources have been used with varying degrees of success. […]
Issues considered during the design of an impressed current type cathodic protection (ICCP) system for corrosion control on the submerged external surfaces of the steel ice shields on the bridge piers are presented. The challenges and cathodic protection (CP) system design solutions, associated with providing […]
The corrosion mitigation benefit of Anotection@ anodic protection (AP) systems in sulphuric acid tanks is well established. AP prevents tank wall wastage, iron contamination of acid and hydrogen grooving of tank walls. Yet, the efficacy of AP at the wet/dry (tidal) zone of tank walls […]
Anodic protection is a powerful technique used to mitigate corrosion of liquor tankage. The large currents required for protection of a typical vessel led to problems in the first generation of commercial systems. This paper describes the cause of the problems and the solutions developed […]
The efficacy of anodic protection (AP) on the wet/dry (tidal) zone of a sulfuric acid (H2SO4) tank wall has been in some doubt. The present work confirmed that AP is effective in mitigating corrosion of nitrogen oxide (NOx)-contaminated H2SO4 in both the submerged and tidal […]
Anodic protection has been shown to prevent corrosion of continuous digesters. Research indicates that this type of protection will also prevent caustic cracking in the both soda and kraft vessels. The purpose of this paper is to familiarize pulp mill personnel with the basic mechanism […]
This article discusses the use of anodic protection (AP) in combating iron contamination, general tank wall wastage, and hydrogen grooving in carbon steel sulfuric acid (H2S04) storage tanks. It also addresses the use of AP for stainless steel acid piping and coolers. Topics include experiences […]
Most metals will corrode within a certain range of electrical solution potential and solution pH. At potentials more negative than this range, corrosion ceases (cathodic protection). At potentials more positive than this range, several metals become passive. For these metals the potential can be shifted […]
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