All of our operatives are fully trained in each metal inspection service to ensure that all inspections are delivered safely and within our strict procedures. Inspection services can be carried out on-site across the UK and internationally, where reports can be issued for individual items on the following inspections.
1. RA (surface roughness)
RA is a measure of the texture of a surface. The roughness of a surface has most commonly been measured by an instrument in which a stylus travels across the surface, the movement of the stylus is amplified and a signal recorded. The result is generally expressed as RA or average roughness and is the arithmetic average value of the deviation of the trace above and below the centreline. The value of RA is normally measured in micrometres. ISO standards use the term CLA (Centre Line Average).
2. Passivation Testing
The corrosion resistance of stainless steel depends on the quality of a very thin oxide layer, so called the (passive layer). Maintaining this passive layer is one of the most important aspects in preserving the quality of stainless steel. Damage of the passive layer, in time, will cause severe corrosion, therefore preserving the passive layer is critical. Unique Polishing can test the passivity of stainless steel quickly and accurately helping you to avoid corrosion issues. Each item that undergoes our in-house pickling and passivation processing receives passivation testing. Alternatively, testing can be performed on site in the UK or Internationally.
3. Ferroxyl Testing
Determines whether austenitic stainless steel needs to be pickled or whether it has been pickled correctly. When structure on the surface of austenitic stainless steel has not been evenly restored, an excess of metallic iron will be present (embedded iron) which will adversely affect the properties of stainless steel. This can be left by carbon steel tools or welding material. The presence of iron particles in stainless steel surfaces disturbs the chromium oxide layer, reducing the corrosion resistance locally. When embedded iron particles are not removed, corrosion is likely to set in. Each item that undergoes our in-house pickling and passivation processing receives Ferroxyl testing. Alternatively, testing can be performed on site in the UK or Internationally.
4. Soluble Salt Testing
Detects salts, particularly chlorides and sulphates of calcium, magnesium and sodium, that are non-visible and require testing to determine. Though they are termed “soluble” they are not soluble at all.
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