corrosion test HAST
From their beginning, NdFeB (neodymium) magnets are characterised by poor neodymium corrosion resistance, in particular to air humidity, which results in disintegration of the magnet material into individual grains. Furthermore, this reaction is accelerated by an increasing temperature. At present, there are magnets available which are resistant to neodymium corrosion; this is achieved by enriching their composition with additional selected elements. Based on the many years of our experience, it is always necessary to strictly supervise the manufacturing process and thoroughly test the corrosion resistance of individual deliveries.
we test the corrosion behaviour of materials
Our laboratories are equipped for common corrosion resistance tests of permanent magnets. We also perform corrosion tests in saturated water vapours with a variable duration.
we focus on
- HAST (Highly Accelerated Stress Test)
- PCT (Pressure Cooker Test), or BCT (Bulk Corrosion Test), based on ASTM A1071/A1071M)
The methods for verifying corrosion properties can also check the resistance of various surface protection methods that are used on magnets with the lowest corrosion resistance. In addition to HAST, we also verify the resistance of coating layers by submerging them in liquid, checking the effects of thermal shocks, and others.
Jan Kratochvil ml.
