Useful information

The purpose of the standards is to promote the development of industry, improve safety and living standards, protect consumers, as well as facilitate domestic and international trade.

The standard is a recommendation. Sometimes, officials and authorities may refer to standards in their orders and directives. Such service or conciliatory standards are binding. They are developed by the Finnish Standardization Association (SFS) and its industry institutions. When developing standards, the main attention is paid to their compliance with modern European standards (EN) and international ISO standards.

Until now, the vast majority of anticorrosive painting standards were national. That is, they were valid only in their own country. The member States of the European Union have formed their own internal market, whose goal is the free movement of goods and services. To ensure the free movement of goods, the member States of the European Union must unify different technical standards.

Methods of painting and painting work and quality control are given in the ISO 12944-7 standard, which corrects the SFS 4959 and SFS 4960 standards. Painting works is a process when it is difficult to assess the quality only based on the final inspection. For this reason, all factors affecting the final result of painting must be directed and controlled during the execution of the work. In the first place are the professional skills of the staff.

Paints are applied to the surface to be painted in various ways. Blurring or brush application, roller application, spray painting, dipping painting, watering painting, filling machine, and rolling painting are the most common painting methods. When choosing the methods of coloring, it should be taken into account:

• Painting place
• The shape and size of objects, their number, as well as the rhythm of coloring
• Pain type
• Number of colors
• Safety and environment

Preparatory work and painting should be carried out under the conditions specified in the description of painting works or in similar conditions to those specified in the standards. The conditions of preparatory processing, painting, or drying of paint should not deviate from the boundary temperatures of air and surface specified in the supplier's instructions. If necessary, such conditions create or interrupt work until the required conditions are met.

Only the paints and thinners specified in the paint specification should be used. These materials should be available in sufficient quantity.

Paints and thinners must be appropriately stored. The packages must be in good condition. Factory packages should be firmly closed, and stickers and labels should be easily read. When storing paint, it is necessary to consider the safety instructions on the factory label, the requirements for storage conditions, and storage periods. Storing paint and varnish products in a room with a constant cool temperature is best.

The durability of the paint is limited. Weather conditions, humidity, aggressive gases, and other environmental factors worsen the condition of the paint surface. Painted metal surfaces are limed, covered with cracks, blisters, rust, and the paint flakes off.

The ISO 4628 standard provides general principles by which the quantity and size of the painted surface needing repair can be classified. According to the photos available in the standard, it is also possible to determine the surface's degree of rusting and swelling.

During repair painting, the same types of paints are usually used as in the original painting if the weak stability of the original painting, the conditions of the painting, or other reasons do not give grounds to change the type of paint.

When organizing a workplace, the following rules should be observed:

• It is possible to limit unnecessary movement and the presence of outsiders at work points.
• Workplace cleanliness can be simplified using replaceable protective paper and similar protective coatings.
• Ventilation in the workplace is one of the most important factors affecting safety in the paint shop and other stationary points where painting is done. In addition to general ventilation, a properly planned local hood can be used.
• For washing, in addition to the usual accessories, they also order cleaning agents, skin creams, and eye cleansers.

Corroding system

The corroding system consists of one or more metal components and all the components of the environment that cause destruction.

Corrosion damage

Corrosion damage is a change in a corroding system caused by corrosion and is considered harmful to the material, its environment, and the technical system to which it belongs.

Anticorrosive painting

Anticorrosive painting protects a metal surface with the help of anticorrosive paint.

Water steam is one of the components of the air, but its content varies greatly depending on the climatic region. The higher the temperature, the more moisture can be contained in the air. In case of a decrease in temperature, excess moisture will settle on the surface. In case of an increase in temperature, the process of evaporation of water from the surface begins, and the absolute water content in the air increases. For practical purposes, relative humidity values, rather than absolute, are usually used, which characterizes the danger of excess moisture falling out on the surface.

The advantages of painting with a brush are the simplicity of this method, the high adhesion of the resulting coating to the substrate, and the convenience of processing small products and small areas of the surface. The paint is rubbed with a brush into small pores and depressions on the surface to be painted, while the remnants of dust, moisture, and other contaminants on the surface are displaced by paint particles, ensuring good contact with the liquid film with the metal.

The degree of drying of each coating layer is monitored to determine the possibility of applying a subsequent layer. The degree of drying of the coating can be controlled by the methods of ISO 1517 standard or by tactile methods (touching fingers). An indicator such as "drying to the touch" is used as a rule.

The number of layers of the applied coating is controlled visually; it should not be less than specified in the technological documentation. For the convenience of control, the individual layers of the coating system should be of different colors and shades.

As a rule, work to eliminate surface defects (burrs, sharp edges, welding splashes, etc.) is carried out during the manufacture of structures before the start of cleaning work. Defects are detected:

• Visually, with a knife or spatula and a touch of your finger
• Unless otherwise specified, the edges should be non-sharp to the touch and without irregularities
• Freshly rolled edges are usually in good condition

Stratifications are formed due to rolling during the rolling process. Cracks with rolling scale and dirt form under the surface. The paint cannot penetrate there, but water does this over time, causing premature corrosion. Delaminations occur even on well-rolled sheets, but more often due to poor rolled steel. In this case, it is only possible to clean the stratifications to the base and, if necessary, brew them in the future.

Mechanized cleaning is performed by rotating wire brushes, machines for stripping with abrasive skins, abrasive grindstones, stripping hammers with electric or pneumatic drives, needle guns, and polished circles.

There are three different types of mechanized tools for surface preparation:

• Percussion cleaning instrument
• Rotating Cleaning Tool
• Rotating Percussion Cleaning Tools

Areas of the surface that are inaccessible to such tools must be prepared manually. Cleaning with a mechanized tool is more efficient and productive than a manual one.

The risks associated with the application of coatings include the following:

• Risk of respiratory tract diseases
• The risk of developing diseases of the musculoskeletal system
• Risk of falling from a height (when applying the coating at height)
• Risk of burns due to explosion or fire, etc

When performing work per the hazardous and harmful production factors, the painter must be provided with and use personal protective equipment.

The surface, seemingly smooth and with evenly applied paint, does not shine brightly enough. This is due to microscopic surface roughness. It is possible to avoid this by using only recommended primers. In the polished version, it is not allowed to apply paint on the under-dried soil. It is necessary to treat the substrate with an abrasive of the required gradation and use only the recommended hardener and solvent and mixing proportions.

The following types of corrosion are distinguished:

• Chemical corrosion — this is a process in which the oxidation of the metal and the reduction of the oxidizing component of the medium occur in one act.
• Electrochemical corrosion —this is the destruction of metals due to their electrochemical interaction with an electrolytically conductive medium, in which the ionization of metal atoms and the reduction of the oxidative component of the medium does not occur in one act and their speeds depend on the magnitude of the electrode potential of the metal
• Biological corrosion —in the case when the corrosion of metal in seawater increases under the influence of fouling of the surface by marine organisms
• Electrocorrosion — increased corrosion under the influence of anodic polarization caused by an external electric field (for example, during welding operations afloat, in the presence of stray currents in the water area)

Application of anticorrosive coating

The AKRUS^® trademark offers anti-corrosion coating services. We produce protective paint and varnish materials that protect against corrosion, fires, exposure to high and low temperatures, moisture, and aggressive chemical compounds. We are ready to carry out objects of protective, civil, infrastructure, and road construction, bridge construction, shipbuilding, and various protective buildings and structures.

The importance of anti-corrosion treatment

Without anticorrosive coatings, protective, construction, and even household technological facilities, pipelines, equipment, and structures are exposed to the negative effects of the sun, solar radiation, air oxygen, rain, and snow. Oxygen in the atmosphere and moisture destroy metals, concrete, and mineral building materials, and temperature changes ultraviolet light accelerate corrosion processes.

Corrosion, affecting materials, makes them more fragile, which can cause structures to collapse, pipelines to break through, leak, and equipment to fail. This entails financial losses, worsens living conditions, and threatens its security. Anticorrosive compounds are designed to solve these problems.

Anticorrosive coatings prevent oxygen and water from oxidizing metals. As a result, thinner and more fragile areas are not formed inside pipes, tanks, and equipment. Protective compounds also prevent sedimentation of deposits inside containers, which preserves throughput and prolongs the service life of pipelines and machines working with liquids.

Moisture in the atmosphere penetrates through the pores of concrete and other mineral building materials. Freezing, it crystallizes, which leads to cracks. Gradual destruction occurs without exposure to low temperatures. The consequences of these processes are also eliminated by anticorrosive compounds.

Corrosion protection allows to:

• To reduce the frequency of maintenance;
• Eliminate the costs of repairs, restoration work, and replacement of equipment or structures;
• Increase security;
• Enchance aesthetic appearance.

As a result, the service life of structures, pipelines, equipment, and surfaces is significantly increased.

Our products and services

The AKRUS^® trademark develops and selects protective compounds for an individual order with the required properties. We also have ready-made formulations suitable for even the most extreme operating conditions. We offer professional application of anticorrosive coatings with specialized equipment, fully complying with SUST paint and varnish standards and customers' desires.

Our specialists accompany all the necessary stages of work — from inspection of the processed objects and their preparation to the application of primers, finishing coatings, and quality control of work.

It is convenient and profitable to cooperate with our company

Our customers receive the following services:

• Durable paint and varnish materials with anticorrosive, heat-resistant properties, capable of serving up to 20 years;
• Variety of choosing color solutions;
• Total support from ordering to production and application of protective compounds;
• Compliance with all requirements of paint and varnish standards;
• Quality assurance, compliance with deadlines and responsibilities.

We are trusted by such corporations as PJSC Gazprom, OAO AK Transneft, PJSC Lukoil, OAO Tatneft, NK Rosneft, HK THK-BP, and other companies. Our production facilities, laboratories for development and control, and technological warehouses allow us to make anti-corrosion coatings genuinely reliable.