How can we test corrosion?
Metals naturally degrade through corrosion mechanisms that can be unpredictable. We have the facilities to carry out environmental tests in the laboratory and outdoor exposing samples to specific conditions. As a result we can understand and measure corrosion and also determine the best material for a particular environment.
We have chambers to recreate naturally occurring environments to meet international standards such as ASTM B117 and ASTM G85 . We are also capable of UV testing and standard electrochemical corrosion techniques.
Rigorous test equipment
- Environmental chambers (salt fog, humidity and temperature)
- UV cabinet
- Long term submerged sea water exposure facilities at the National Oceanography Centre, Southampton
- Outdoor exposure racking with weather station
- Cathodic protection measurement equipment
- Pull-off adhesion test equipment
- Colour change analysis
- Gloss change analysis
- Scratch test equipment
nC2 has bench top laboratory potentiostats capable of standard electrochemical corrosion techniques to determine corrosion rates and surface characteristics. As a result, we use electrochemical techniques to accelerate corrosion testing and so can offer them as stand-alone tests or to complement environmental (salt fog) testing. Testing includes:
- Tafel extrapolation
- Linear polarisation resistance
- Zero resistance ammetry
- Impedance spectroscopy
- Potential monitoring
Prior to salt fog testing we can scribe samples to a uniform depth using a scratch tester. The equipment conforms to ISO 1518-1 to determine scratch resistance and ISO 2409 to measure cross cut adhesion.
Samples under test
Samples can be inspected regularly to determine the time taken for the onset of corrosion or to monitor the corrosion over time.
UV testing can be carried out to compliment environmental testing. Our QUV SE UV chamber is capable of testing to international standards such as ASTMG154, ISO 4892 and ISO 16474 and recreates the damage caused by UV light, rain and dew. Typical damage can include colour and gloss change, crazing and blistering.
Gloss measurements can be taken in accordance with ISO 2813 at 20, 60 & 85 degrees (High gloss, semi gloss and low gloss / matt).
The Lab colour can be monitored using a photospectrometer conforming to BS 3900. Three parameters are measured to give a 3D colour space value. L represents lightness, a represents the green red axis and b the blue yellow axis.
Pull off adhesion
Our 510 Pull-off adhesion gauge conforms to ISO 4624 and ASTM D4541. Testing provides information such as coating strength and whether cohesive or adhesive failures are occurring within the coating or coating layers.
Outdoor exposure racking
For long term testing, racking can be employed in a safe and exposed location on one of our roof tops.
Sea water immersion
We also have facilities at the National Oceanographic Centre (NOC) at Southampton docks to immerse samples in flowing sea water.
One of our environmental chamber.