How Can Metals Be Tested for Surface Protection?

How Can Metals Be Tested for Surface Protection?

Tested for Surface Protection

Paints are used for making a protective covering over any surface. The surface might need protection from many factors like humidity, water penetration, light and other natural factors. On the metallic surface, the coating plays an important role in keeping the corrosion at bay. The environmental conditions impact the surface coating of metal a lot. And, if coating starts to chip off, it exposes the metal to environmental conditions that initiate corrosion. Prior to mass production, the samples are often under different circumstances to estimate the shelf life.

Salt Spray Chamber is widely used in metal industry to assess the resistance of coated and uncoated materials in harsh environmental conditions. This test doesn’t give any numeric value after the completion, but a visual inspection is needed to be done. This visual inspection tells a lot about the behaviour of the metal in an accelerated test.


In this test, a salty fog is created inside an enclosed chamber having a predefined temperature of approx. 37°C. The metal sample is placed inside the chamber for a specific duration. Once the test run is complete, the sample is taken out and analysed if it survived the simulated condition or not. The salt spray test is performed according to the testing standards. The humidity percentage, temperature, test duration; everything is predefined in the standards.

What is a Corrosion Test Chamber?

In a salt spray chambera salty fog is created using NaCl solution. The fog consists of 5% of salt which is way more than sea water. The pH level of the solution must remain in between 6.5 to 7. The salt should be iodine free. This solution is combined with water and converted in the form of fog using an atomiser. The atomiser comes in two styles, spray style and tower style with baffle at the top. It is very important for the chamber to maintain the simulated conditions until the test completes. Any leakage in the chamber may result in uneven test results.

Presto’s corrosion test chamber has double layered insulation to avoid any heat loss during the test. The tower style atomiser with baffle at the top ensures the uniform fog distribution inside the chamber. While performing the test, it is always advised to keep the samples away from the wall. The close proximity of the sample with walls may result in the uneven effect of environment on the sample.


Presto offers this machine in different capacities with multiple models. For more information about the machine, just call us.