WED | Top Tips To Help You Choose The Best Detection Methods for Corrosion | Corrosion is a major issue for many businesses and buildings. It can happen to anything made of metal, exposure to oxygen and water creates a chemical reaction with the metal, effectively oxidizing it. This causes the surface to be weakened and, at some point, it will fail.
As oxygen and water are carried in the air all the components needed for corrosion exist in nature. Considering the damage that can be done when metal structures fail, it’s essential to undertake regular checks for corrosion. This allows you the opportunity to prevent the issue from getting worse.
In some cases, a visual inspection is possible, such as with a metal building. In other cases, such as with metal oil pipelines, it’s simply impossible to insect the entire structurally visually. The problem with visual inspections is that by the time corrosion is visible a lot of damage will already have been done.
Potentially a much better solution is to use dye penetrant testing. This is a process that allows a specific liquid to penetrate the surface to be tested. The dye allows you to track the movement of the liquid. The liquid generally flows in one direction but it will also fill any crack and crevice it finds.
By monitoring the path of the liquid you’ll be able to identify corrosion that’s invisible to the naked eye. It’s not just effective at checking for corrosion on existing items. You can also use this process to ensure something has been manufactured correctly, without hairline cracks.
Dye penetrant is a cheap option and effective, it doesn’t damage the surface, and is accurate. This makes it one of the best ways to check for corrosion.
Electricity can move easily through many substances. Using a meter you can measure the resistance the electricity encounters. The more resistant it is the less conductive the substance is.
By knowing how conductive your substance should be you can monitor it regularly to see if this changes. Changes suggest corrosion or warping, you’ll need to investigate further to identify the exact issue and resolve it, if possible.
Linear Polarization Resistance
This uses an electric current. It’s applied to a specially designed electrode and provides an instantaneous measurement of the current rate of corrosion. It’s an effective approach but can only be used on conductive substances in an aqueous solution.
Choosing The Right Detection Method
It can be difficult to know which detection method will be most appropriate to use. There are many variables to consider, such as the material, where it’s located, whether you can use an invasive technique and other concerns.
That’s why it’s essential to talk to a professional and discuss the options open to you. However, if you’re in any doubt it’s worth trying the penetrant dye approach. This can be used on most surfaces, it’s non-invasive and effective.
Don’t forget, once you’ve found a good testing method you need to test regularly, this will help to ensure you identify any issue early and can take steps to resolve it.