The industrial environment, which is particularly harsh, is one of the biggest challenges when it comes to anti-corrosion protection.
At Decoman, process optimisation and continuous improvement to equipment mean that we are at the cutting edge of treatment and protection of industrial surfaces following current UNE standards.
Industrial paint and surface treatment protects the various surfaces from the aggressive environments they are subject to and gives a much better aesthetic appearance, increasing its added value.
industrial paint and surface treatment main services
This is an electrochemical process where the steel turns into iron oxide due to the inexorable advance of damp and oxygen.
An appropriate procedure for preventing it is the formation of a waterproof barrier which impedes the combined effect of damp and oxygen. As the chemical reaction does not happen, there is no rust.
The waterproof barrier is created with paint and, because of this, it is highly important to use the best quality products.
The quality of the paint defines its capacity to protect. The higher the quality, the more difficult it is for damp and oxygen to affect the surface.
Waterproof barrier (Paint)
Paint is a product in liquid or pasty form which, during the drying process, becomes a solid, plastic, adherent film which protects and decorates.
- Binders: These are the basic component of the paint. The paint’s qualities depend on them.
- Pigments: Give colour and opacity to the coat of paint.
- Solvents: Facilitate painting as without them the paint would have a very high viscosity.
- Additives: Have a specific function and are added to improve the paint’s quality and attributes.
- Undercoat: The first coat of paint directly onto the surface. It serves as an anchor for the next coats and prevents rust with anti-corrosion pigments.
- Intermediate coats: Applied onto the undercoat in some processes. The Pigment/Binder ratio is lower than in the undercoats but higher than in the finishing paints.
- Finish: Applied as the top coat. These are formulated for the best possible waterproofing and to be hard wearing. They can have a gloss, satin or matt finish.
- Varnishes: Coatings made from binders and solvents. They have a transparent finish.
All kinds of paint are defined by a series of specifications which serve for control, by the manufacturer or the user, of whether they comply with the stipulations or not.
- Liquid paint: Stability, viscosity, specific weight or density, solids’ content in weight or volume, performance, product life, dilution, type of application and drying time.
- Dry paint: Appearance, scratch resistance, salt spray resistance, gloss, adherence, weather resistance, coverage, flexibility, yellowing, impact resistance, temperature resistance and robustness.
This is a crucial factor prior to painting.
Inadequate preparation of a surface followed by a good painting system usually throws up worse results than using lower quality products on a well-prepared surface.
The nature and size of the material, its superficial condition, the presence of rust or coats of old paint define the cleaning or preparation procedure to be followed. The main procedures are as follows:
- Degreasing: Any grease or oil present must be completely eliminated before starting to paint. The most usual procedures are cleaning with degreasers and very high pressure washing (750-1000 bar).
- Manual and mechanical cleaning: This involves cleaning the surface by brushing, scraping, grinding and sanding the metal to eliminate rust, scale or old paint. It is done where it is not possible to use other methods. The preparation grades for scraping and brushing are defined in the UNE EN ISO 12944-4 standard.
- Shot blasting: The surface to be prepared is blasted with small particles of abrasive materials at high speed using compressed air through a hose with a special nozzle. The abrasive material can be steel abrasive, beads, aluminium oxide or silicates, etc. It is the most effective way of cleaning as it completely eliminates any contaminants and paint, leaving the surface completely clean.
Metal prepared in this way has a highly active surface which rusts easily due to atmospheric damp or contaminants and therefore it should be painted immediately.
Shot blasting preparation grades (SIS 055900):
Sa1. Brush-off blasting. Lightly attached mill scale, rust scale, layers of paint and any foreign material are removed.
Sa2. Commercial blasting. Mill scale, rust scale, layers of paint and any foreign material are removed. Any residual contamination must be firmly adhered. The surface should end up as near-white in colour.
Sa3. White metal blasting. Mill scale, rust scale, layers of paint and any foreign material are removed. The surface should end up as uniform white metal.
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