A novel set-up using Julabo immersion coolers to regulate temperature in a closed bath is being used for corrosion-related experiments at the Nuclear Materials Section at the South African Nuclear Energy Corporation SOC Limited.
Ryno van der Merwe, a metallurgist in the division required a separate cooling device while testing the corrosion rates of various steels and metallic alloys in hydrofluoric acid. The study aims to define the corrosion characteristics of these metals under a variety of conditions. The influence of temperature on corrosion rates is one major factor and the corrosion data from the study will assist in future material selection of critical plant components. Instead of acquiring a completely new system for this project, immersion coolers were added to their existing baths at a fraction of the cost.
To conduct the experiments, two thermocouple PT temperature probes are being used to regulate and control the fluid temperature. The first probe leads from the immersion cooler situated on the outside of the fume hood to the existing water bath situated inside, while an internal PT temperature probe is fitted inside the water bath. A customised protective lid also fits over the water bath, which serves to shield all components above water level.
The immersion cooler, model FT402, is used to rapidly counter cool between the ranges of -40°C – 30°C with a temperature stability of 0.5°C. This reading is clearly digitally displayed on the screen of the unit. To ensure no freezing takes place below ambient temperatures, Julabo thermal bath fluids are used inside the water bath to give the best results in terms of viscosity, heat conductivity and stability. The FT402 saves water as no tap water is required for cooling, and it can be used as a substitute for dry ice. This compact unit is also user-friendly and gives added piece of mind while the experiment is running at the required temperature specifications in a controlled environment.
Tel: 011 315 5434
Fax: 011 315-5882