Performance Testing Methods for Anticorrosive Coatings
Anti-corrosion coatings are divided into two types: conventional anti-corrosion coatings and heavy-duty anti-corrosion coatings, each with its own characteristics. Conventional anti-corrosion coatings can generally prevent metal from corroding and extend the lifespan of the metal; while heavy-duty anti-corrosion coatings can provide more durable effects in corrosive environments.
What are the specific characteristics of anti-corrosion coatings? I believe many people do not have a very clear understanding of this question.
1. Anti-corrosion coatings can be used in environments prone to corrosion and can keep items from corroding. To be specific, for example, when constructing a cross-sea bridge, under the harsh conditions of seawater, applying anti-corrosion coatings to the metal of the bridge piers can extend the lifespan of the metal by 10 years or even more. The harsh environments we are referring to are in chemical atmospheres or marine environments.
2. There are very strict standards for thick film coatings. The standard for general anti-corrosion materials is around 100μm or 150μm. Heavy-duty anti-corrosion coatings need to be above 300μm or more. Within this standard range, their anti-corrosion effect is optimal.
3. Anti-corrosion coatings are very efficient and convenient to use, and their application methods are very flexible. When the application temperature is not very low (above 20°C) and the humidity is similar, their curing speed is very fast. Generally, after one or two days of application, other projects can be carried out, such as handling or cutting. Some anti-corrosion coatings can also be used in conjunction with other industrial paints to improve our construction efficiency.
Detection methods for anti-corrosion coatings:
1. Determination of film adhesion: As the name suggests, film adhesion refers to the firmness of the anti-corrosion coating adhered to the material. We can scrape or slide a small knife on the surface of the material to see the results. Common methods for determining film adhesion include the circle method, grid method, and pull-off method.
2. Thickness detection: I mentioned earlier about the standards for thick film coatings: the standard for general anti-corrosion materials is around 100μm or 150μm, while heavy-duty anti-corrosion coatings need to be above 300μm or more. Within this standard range, their anti-corrosion effect is optimal. Therefore, detecting the thickness is very important. The determination methods are divided into destructive testing and non-destructive testing. These two methods are used to test whether the thickness is within the standard range.
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