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Salt spray has a very potent effect on corrosion and not knowing how products react long term to a corrosive environment or chemical, can have devastating effects for the end user and the original manufacturer. Salt spray testing is a laboratory simulation of a corrosive saline environment thatcorrosion extraction tests the performance of items on their surfaces after corrosive protection treatments including coating, galvanising, painting and anodising.
Test chambers are designed so that this can be done in a controlled environment to ensure that the corrosion rate is measured accurately whether in terms of simulated time or to the point of entire destruction. Their primary function is to accelerate the natural process by incorporating various corrosive factors that exist in the natural environment, to simulate time in an environment with certain characteristics.
Finding the long-term resistance to corrosion of materials requires the speeding up of corrosion by using certain substances. For example, a salt spray testing chamber would recreate the effects of a harsh offshore environment using a salt fog test to evaluate the corrosive properties of supplies, such as, paint coatings and phosphate surfaces. This will simulate the effects of years of exposure to salt spray.
By testing in a chamber the variables can be controlled to ensure the measure of corrosion is as accurate as possible. Components are subjected to a corrosive environment without introducing other contaminants into the test area. Chambers are often designed to test for compliance with standards in both steady state tests and cyclic salt spray tests. When components or surface finishes pass testing, they are considered compliant with corrosion resistance standards such as, MIL-STD-202H, BS EN 60068-2-52 or ASTM-B117.
Industrial Fans for Environmental Chambers
As the environment in the chamber is designed to corrode metal or similar materials, the entire system is manufactured from corrosion resistant components. The extract system will also corrode if metal fans and metal ductwork are used directly in the corrosive section of the test chamber. If components are used to add air to dilute a saline solution then these are often kept outside of the test chamber and as such do not need to be corrosion resistant. For this we supply the Ecofit GRE G9 range of EC forward curved centrifugal fans, but quite often units are recirculating the saline solution air, so corrosion resistant fans are required.
Our S range of polypropylene fans are suitable for this type of application as they are resistant to corrosion and a wide range of chemicals. Our fans are single inlet centrifugal type complete with a pedestal for floor or wall mounting. Different materials are available for our pedestals depending on the setting. To fine tune the required airflow rate, we also offer inverters for fine speed control of the fan. The inverter can also have pre-selected speeds depending on requirements. We can also offer fans for other types testing in chambers such as, heat testing and humidity testing. This type of equipment has a wide range for which we can offer different types of fans.
Hot Gas Fans for Temperature Chambers
Our wide range of specialised industrial fans are suitable for other test environments including temperature chambers, climatic chambers and environmental chambers. Hot gas fans such as the DTR from Ecofit can withstand exposure to intense conditions, and often used to ventilate temperature and climatic chambers with one part of the impeller situated in an enclosed part of the chamber.
Whatever you’re working with, our team of fan integration experts can advise on the most appropriate method and fan model to suit your application and specification.
For more information about extraction from test chambers, contact our team on 01782 349 430 or email sales@axair-fans.co.uk or visit the EC polypropylene fans page for our energy efficient range.
For more information on Corrosion Resistant Extraction Fans for Salt Spray Chambers talk to Axair Fans UK Ltd