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Air Sand Erosion

Talk to us about air-sand erosion testing

Introduction

Air – Sand erosion test method can be used to assess the erosion resistance behaviour and rank the performances of various engineering materials, for example, materials for the design and manufacture of gas compressors used in the oil and gas industry. The sonic air – sand rig housed within the laboratory of the University of Southampton is typically used to carry out comparative study to assess materials for their erosion resistance performances.

 

Air sand erosion test rig

The air sand erosion rig

Samples are inserted into the test chamber and the erodent is fed through the vibrating hopper at the top of the rig. The test conforms to ASTM G76 which states that the samples are removed at known intervals and weighed.

 

 

Data analysis of air sand tests

Post-test analysis for a typical air – sand test would involve plotting the cumulative mass loss against cumulative erosion time, after measuring the mass loss for each material at a set interval. The average of the mass loss for each material is calculated, converted to volume loss using the densities of the materials and plotted to assess their overall erosion performances.

 

Plotting mass loss over time

  • 30° Impingement angle

    Picture of a tested coated sample at 30° impingement angle. Note: the coating has been penetrated to the substrate.

  • 30° Impingement angle

    Picture of a tested coated sample at 30° impingement angle. Note: the coating has been penetrated to the substrate.

  • 90° Impingement angle

    Picture of a tested coated sample at 90° impingement angle. Note: coating was penetrated after 10 minutes.

  • Scanning Electron microscopy

    SEM image of an air – sand erosion tested 316 stainless steel. The cutting pattern suggests a ductile mechanism.

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