Today we will talk about the main factors to take into account when choosing the right product.r a protection system for a metal structure.
Steel exposed to atmospheric conditions or in contact with water is subject to corrosion processes that promote deterioration. To extend their service life and prevent damage caused by corrosion, steel structures are protected with multilayer paint systems (anti-corrosion systems).
Prior to the application of the protection system, it is advisable to pre-treat the substrate to ensure a healthy metal surface and better adhesion of the primer and paint layers according to UNE-EN ISO 8501-1:2008.
TREATMENT OF METALLIC STRUCTURES (II).
FACTORS TO BE CONSIDERED IN THE SELECTION OF A STEEL PROTECTION SYSTEM
The standard UNE-EN ISO 12944 - to be applied to carbon steel structures with a thickness of not less than 3 mm. – takes two factors into account when protecting steel from corrosion:
The corrosiveness of the environment where it will be installed.
The required durability.
CORROSIVITY CLASSES
In the updated version of the standard (2018), a number of modifications have been made to corrosivity categories C1 to C5 (ranging from very low to very high), and a new category, CX (Extreme), has been included for offshore and industrial environments with high humidity.
DURABILITY OF PROTECTION
We must also be clear that the range of durability of a protection NO is a period of warranty. Durability is a technical consideration and a planning parameter that can help the property establish a maintenance. The standard therefore provides guidance on the expected useful life of a coating system until its first major maintenance.
The durability of a paint protection system depends on several parameters, such as:
Atmospheric conditions
Design of the structure
Accessibility of the asset
Application conditions
SELECTION OF THE PROTECTION SYSTEM
When selecting a corrosion protection system, as we have seen so far, the following steps should be followed:
- Define the corrosion category that matches your project conditions
- Determine durability requirements according to ISO
- And finally select the system according to the project requirements and commercially available solutions.
Another recent change in UNE-EN ISO 12944 is the establishment, as a standard, of a minimum number of layers and dry film thickness of the system for each category of corrosion and durability required.
EXECUTION ERRORS
The errors The most frequent execution methods when applying corrosion protection are as follows:
Poor preparation of the metal substrate on which the coating is to be applied.
Poor paint quality.
Not respecting the order of layers in a multilayer protection system or the minimum times between layers.
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