Anodic protection is a powerful technique used to mitigate liquor tankage corrosion. The large currents required to protect a typical vessel led to problems in the first generation of commercial systems. This article describes what caused the problems. Part II (March 2002 MP) will discuss […]
Corrosion is best defined as “the process by which a material, usually a metal, combines with certain elements within its environment to produce a product that does not retain the useful properties of the original material”. Unfortunately, this seemingly innocuous textbook definition does not convey […]
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 […]
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