Anti-corrosion coatings in industry – specification, application, methods

The technical and construction industry uses increasingly modern methods of securing steel elements. The basic factor affecting the durability of prepared products is resistance to external weather conditions. As a result of the influence of water, moisture, snow and changing temperatures, rusty efflorescence often appears on steel elements. How can they be prevented? Anti-corrosion coatings used en masse by industrial painting plants are key here. How do we divide anti-corrosion coatings and how to choose the best one for a given structure? Let’s find out!

Light anti-corrosion – what paints and varnishes protect steel elements?

In the industrial painting plant, we primarily use paint coatings that protect steel parts against corrosion in specific environmental conditions. The table below presents the most important factors influencing the type of paint coating used for a given type of steel product.

Category

Size

Environmental characteristics

C1

Very little

It occurs mainly in dry, non-production office and social rooms, inside air-conditioned buildings and warehouses

C2

Little

Found in dry climates, deprived of industrial pollution, where moisture condensation is possible in closed rooms

C3

Medium

Typical of atmospheric environments, both open and closed, corresponds to average annual climate changes and their impact on building materials and industrial loads without chemical aggression

C4

Big

Characterizes industrial and seaside environments exposed to natural salt aerosols and condensation mists containing chemical substances

C5-1

Very big

Refers to humid, aggressive industrial environments

C5-2

Very big

Related to corrosion hazards caused by salty sea water

Components that are most susceptible to corrosion are immersed in water or in direct contact with humid environmental conditions. According to the PN-EN ISO 12944 standard, the protection period after applying the anti-corrosion coating should range from 5 to even over 15 years. During this time, the steel surface should not be damaged by corrosion.

Corrosion protection

Standards and principles – According to the PN-EN 14879 standard, the first part (terminology, design, substrate preparation) imposes important design principles, limiting the traditional approach to “error design”. This methodology requires cooperation between the designer and the coating contractor to ensure the so-called processability of the substrate, which is crucial for the correct application and testing of the protective coating.

The basic question is: which steel elements are suitable for covering with rubber, laminate or plastic to avoid damage related to the inappropriate structure of the substrate. Generally speaking, in the case of industrial painting, the most durable anti-corrosion protection is powder coating, where varnish is applied to steel elements and hardened at high temperatures. Liquid varnishing also provides protection, which additionally provides interesting visual and touch effects and does not disturb dimensional tolerances.

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