Resisting corrosion attack

Citation

(1998), "Resisting corrosion attack", Anti-Corrosion Methods and Materials, Vol. 45 No. 2. https://doi.org/10.1108/acmm.1998.12845bab.004

Resisting corrosion attack

Methods

Resisting corrosion attack

Plant operating in the aggressive environment created by raw paper pulp processing is often subject to rapid and serious deterioration, owing to corrosion attack. This problem is further aggravated by fluctuating temperatures and the likelihood of abrasion damage which can characterise this type of application.

Back in 1994, the Ellesmere Port-based Bridgewater Paper Company first approached anti-corrosion coating specialists Corrocoat to discuss the potential afforded by advanced coating solutions to protect the mild steel shafts of de-inked stock feed screw conveyors.

Corrocoat's team of chemists and mechanical engineers looked closely at the demands of the application and the environment, and recommended the use of a material developed by Corrocoat to combat corrosion/erosion and abrasion damage in such environments. Known as Plasmet HTE, the material is a highly abrasion-resistant resin-based coating loaded with silicon carbide, stainless steel and glass flake, capable of handling immersed temperatures up to 145°C.

The first feed screw conveyor was removed from service at Bridgewater Paper Company in August of 1994, and treated using Plasmet HTE at Corrocoat's Leeds workshops. The scope of work involved pre-machining to accommodate the coating thickness, grit blasting to Swedish Standard SA 2.5, application of Plasmet HTE and subsequent test procedures in line with quality standards.

The conveyor was installed back at Bridgewater just three weeks later. Inspection six months after installation reportedly showed the unit to be in first class condition. Today, after more than four years in service, it continues to operate satisfactorily.

Since this early work, a further four feed screw conveyors have been treated by Corrocoat, working to similar specifications. All are stated to have continued to operate effectively for Bridgewater without further noticeable corrosion problems.

Details from Corrocoat Services Ltd. Tel: +44 (0) 113 276 0760; Fax: +44 (0) 113 276 0700; E-mail: enquiries@corrocoat.com