Composition for cleaning surfaces made of concrete, brick and gypsum using chemical milling, removing cement film, activating adhesion, preparing surfaces for waterproofing, cleaning facades from efflorescence and cement deposits of mineral bases: concrete, brick, ceramics, natural and artificial stone, gypsum, slate , as well as to combat fungal and mold formations. The composition is also used to clean metal, ceramic, cast iron, enameled and acrylic plumbing fixtures from rust deposits.

Application and properties

Adhesion- The material is intended for cleaning the cement film, eliminating the “cold seam”, creating a monolith and increasing the adhesion of layers of monolithic concrete, cement, gypsum and magnesium floor screeds by 1.5-3 times.

Preparing the base- for the application of penetrating waterproofing materials, cement, epoxy, polyurethane and acrylate self-leveling floors and joint sealants. Eliminates the need to use primers.

Removal of mold and fungal formations from concrete, plaster and brick surfaces. Works in combination with biocidal and antiseptic materials "ArmMix".

Removing efflorescence from concrete and brick- cleans the surface of brick and concrete from salts, works in combination with a water repellent.

Removing rust deposits from metal, from acrylic, enameled, cast iron and ceramic sanitary ware

When carrying out concrete work, situations often arise when it is not possible to carry out the work of pouring the entire object at once, without interruptions. As a result of this, during subsequent pouring, a cold seam appears at the point of contact between the old and new concreting layers. A cold seam, as a rule, leads to a loss of joint strength and a violation of water tightness (which manifests itself in the appearance of leaks).

Another problem that our clients often face is conducting finishing works on a concrete surface. 8 hours after the concrete has set, a cement film forms on its surface, which prevents adhesion, that is, it reduces the adhesion of concrete and finishing material. If it is not removed, the connection will be weak and there is a high probability of peeling and destruction of the plaster or floor (screed). To remove the cement film, as a rule, mechanical removal methods are used (mechanical milling of concrete) or acids (usually hydrochloric acid) are used. Both of these methods have their drawbacks: the first is associated with the use of expensive equipment (sand or shot blasting machines) and weakening of the structure, the second is associated with the harmful effects of acids and solvents on the structure and workers.

We offer a solution to the problem of cold joints and removal of cement film by chemical milling surfaces using the composition "ArmMix Cleaner". This is a ready-to-use composition for water based, made from complex polyfunctional acids. No odor, no effect harmful effects per person and environment. Approved for use and operation by the Ministry of Health of the Russian Federation for interior and exterior work during the construction and repair of residential, public and industrial buildings and structures. Does not contain hydrochloric, acetic, citric, orthophosphoric acids or solvents that destroy concrete.

Advantages and qualities

Dissolution of cement film without destruction of cement stone. Opening of pores and adhesive activation of building substrates. Removing efflorescence from facades (brick, concrete, stone foundations) of buildings. Removing rusty deposits from surfaces.

Composition - pink acidic cleaner with pH = 1-2 dissolves cement film, opens pores and increases the depth of penetration of coatings into concrete, increases adhesion strength to the base.

1. Exclusion of manual mechanical cleaning and machine milling, sand-, shot-, hydro- and hydro-sandblasting, the use of diamond tools and hammer drills for notching the concrete surface.
2. Eliminates the need to use plaster mesh.
3. Reducing labor intensity and cost of work.

Mode of application

1. Work should be carried out at ambient temperatures from +5°C to +30°C.
2. Mechanically clean the surface of the base from loose particles, dirt and remove dust.
3. Using a brush, roller or spray, apply ArmMix Cleaner to the base in one or several passes until the cement film and efflorescence are dissolved and pores and microcracks open.
   During the cleaning process, a chemical reaction occurs that releases carbon dioxide.
4. Wash off any remaining reaction with water.

Air drying

1. before applying mineral screeds, plasters, tile adhesives, sealants and self-leveling floors - 1 hour;
2. before applying polymer self-leveling floors and sealants - to the required residual moisture of the concrete.

Additional product information

Safety requirements:

The composition is fireproof. Carry out work in compliance with safety requirements when working with acids with pH=1-2. Work in overalls, safety glasses and rubber gloves. If the composition gets into your eyes, skin or mucous membranes, rinse them with water. Keep away from children.

Approximate consumption

0.1 - 0.3 l/m2.

Package

plastic canisters 1l, 5l and 10l

Transportation and storage

The packaged composition is transported by road, rail and other modes of transport in accordance with the rules of transportation and cargo securing in force for this type of transport. The packaged composition is stored in dry rooms at a temperature not lower than +5°C under conditions that ensure the safety of the packaging and protection from moisture.

manufacturer's warranty

The guaranteed shelf life of the composition is 1 year from the date of manufacture. Presence of sediment is allowed. Do not freeze. The color shades of the composition are not regulated.

Price

The essence of the chemical milling process is the controlled removal of material from the surface of the workpiece by dissolving it in an etchant due to a chemical reaction. Areas of the workpiece that are not subject to dissolution are covered with a protective layer of chemically resistant material.

The removal rate of many materials is up to 0.1 mm/min.

Advantages of the process:

· high productivity and quality of processing,

· the ability to obtain parts of complex configurations of both small and significant thickness (0.1-50) mm;

· low energy costs (chemical energy is mainly used);

· short production preparation cycle and ease of automation;

· waste-free due to regeneration of process products.

During processing, material removal can be carried out from the entire surface of the workpiece, to various depths or to the entire thickness of the part (through milling). Chemical milling includes the following main stages: preparation of the workpiece surface; applying a protective layer of the pattern; chemical etching; removal of the protective layer and quality control of products (see Fig. 3.1).

Surface preparation means cleaning it from organic and inorganic substances, for example, using electrochemical degreasing. The degree of purification is determined by the requirements for subsequent operations.

The application of the protective layer of the design is carried out using the following methods: manual and mechanized engraving on the mistaken (varnish, wax) layer, xerography, screen printing, offset printing, as well as photochemical printing.

In instrument making, the most widely used method is photochemical printing, which ensures small product sizes and high accuracy. In this case, to obtain a protective layer of a given configuration, a photomask is used (a photocopy of the part on an enlarged scale on a transparent material). Liquid and film photoresists with photosensitivity are used as a protective layer. Liquids, the most developed in industry, require High Quality cleaning the surface of workpieces. To apply them to the surface, one of the following methods is used: immersion, watering, spraying, centrifuging, roller rolling, spraying in an electrostatic field. The choice of method depends on the type of production (continuous application or on individual workpieces); requirements for the thickness and uniformity of the film formed, which determine the accuracy of the pattern dimensions and the protective properties of the resist.

Rice. 3.1. General diagram of the technological process of chemical milling.

Photochemical printing of a protective pattern, in addition to the operation of applying photoresist and drying it, includes the operations of exposing the photoresist layer through a photomask, developing the pattern and tanning the protective layer. During development, certain areas of the photoresist layer dissolve and are removed from the surface of the workpiece. The remaining layer of photoresist in the form of a pattern determined by the photomask, after additional heat treatment- tanning - serves as a protective layer during the subsequent chemical etching operation.

The chemical etching operation determines the final quality and yield of the product. The etching process occurs not only perpendicular to the surface of the workpiece, but also sideways (under the protective layer), which reduces the processing accuracy. The amount of etching is assessed through the etching factor, which is equal to , where H tr is the etching depth, e is the amount of etching. The rate of dissolution is determined by the properties of the metal being processed, the composition of the etching solution, its temperature, the method of supplying the solution to the surface, the conditions for removing reaction products and maintaining the etching properties of the solution. Timely termination of the dissolution reaction ensures the specified processing accuracy, which is approximately 10% of the processing (etching) depth.

Currently, etchants based on salts with an amine oxidizer are widely used, among which the most commonly used are chlorine, oxygen compounds of chlorine, dichromate, sulfate, nitrate, hydrogen peroxide, and fluorine. For copper and its alloys, kovar, steel and other alloys, solutions of ferric chloride (FeCl 3) with a concentration of 28 to 40% (by weight) and a temperature within (20 - 50) C, which provide a dissolution rate of (20 - 50) µm/min.

Among the known methods of etching there is immersion of the workpiece in a calm solution; into a stirred solution; spraying the solution; spraying the solution; jet etching (horizontal or vertical). The best processing accuracy is ensured by jet etching, which consists in the fact that an etching solution under pressure is supplied through nozzles to the surface of the workpiece in the form of jets.

Quality control of parts includes visual inspection of their surface and measurement of individual elements.

The chemical milling process is most beneficial in the manufacture of flat parts of complex configurations, which in some cases can also be produced by mechanical stamping. Practice has established that when processing batches of parts in quantities up to 100 thousand, chemical milling is more profitable, and over 100 thousand, stamping is more profitable. For very complex configurations of parts, when it is impossible to make a stamp, only chemical milling is used. It should be taken into account that the chemical milling process does not allow the production of parts with sharp or right angles. The radius of curvature of the internal corner must be at least half the thickness of the workpiece S, and the external corner - more than 1/3 S, the diameter of the holes and the width of the grooves of the parts must be more than 2 S.

The method has found wide application in electronics, radio engineering, electrical engineering and other industries in the production of printed circuit boards, integrated circuits, in the manufacture of various flat parts with complex configurations (flat springs, raster masks for picture tubes of color TVs, masks with circuit patterns used in thermal spraying processes , grids for razors, centrifuges and other parts).

I read about this interesting processing method. I want to implement it on a CNC machine :)

From the book "Handbook of Technological Engineer in Mechanical Engineering" (Babichev A.P.):

Electrochemical dimensional machining is based on the phenomenon of anodic (electrochemical) dissolution of the metal when current passes through an electrolyte supplied under pressure into the gap between the electrodes without direct contact between the tool and the workpiece. Therefore, another name for this method is anodic chemical treatment.

During the processing process, the tool electrode is the cathode, and the workpiece is the anode. The electrode-tool moves progressively at speed Vn. The electrolyte is fed into the interelectrode gap. Intensive movement of the electrolyte ensures a stable and highly productive course of the anodic dissolution process, removal of dissolution products from the working gap and removal of heat arising during the processing process. As the metal is removed from the anode workpiece, the cathode tool is supplied.

The speed of anodic dissolution and processing accuracy are higher, the smaller the interelectrode gap. However, as the gap decreases, the process of its regulation becomes more complicated, the resistance to pumping the electrolyte increases, and breakdown can occur, causing damage to the surface being treated. Due to the increase in gas filling at small gaps, the rate of anodic dissolution decreases. Should choose

such a gap size at which the optimal metal removal rate and forming accuracy are achieved.

To obtain high technological performance of ECM, it is necessary that electrolytes meet the following requirements: complete or partial elimination of side reactions that reduce current efficiency; anodic dissolution of the workpiece metal only in the processing zone, excluding the dissolution of unprocessed surfaces, i.e. the presence of high localizing properties, ensuring flow in all areas of the workpiece surface being processed electric current calculated value.

The most common electrolytes are neutral solutions of inorganic chloride salts, sodium and potassium nitrates and sulfates. These salts are cheap and harmless to service personnel. An aqueous solution of sodium chloride (table salt) NaCl is widely used due to its low cost and long-term performance, which is ensured by the continuous reduction of sodium chloride in the solution.

ECM installations must have filters for cleaning the electrolyte.

I am pleased with the achieved roundness of the hole. But the funnel shape is not pleasing.

Now I’ll try to pump the electrolyte through a medical needle.

Concrete milling is actually the removal of a layer of concrete to a specified depth.

Application area:

Concrete milling is a fairly aggressive action and is used in the following cases:

1. leveling the concrete surface;
2.removal of the top layer of a monolithic slab, foundation or floor located above the required level;
3. removal of old polymer coating, or laid in violation of technological requirements;
4. removing linoleum or tiles laid with glue from concrete;
5. cleaning the contaminated surface from stains and various types glue;
6. Install anti-slip zones on pedestrian areas. Treatment of the road surface to improve the adhesion of the surface to the tires Vehicle on ramps and exits;
7. as a preparatory procedure before applying to concrete various materials, increasing interlayer adhesion.

Milling a concrete floor allows you to get a smoother surface with increased adhesive properties. In addition, the use of this technology can eliminate the step of creating an additional screed in the construction of concrete floors.

Types of milling:

1. mechanical, using special equipment equipped with diamond-coated cutting tools. Processing is carried out using a “drum” milling element. The operating principle of the milling unit is the rotation of the drum. Under the influence of torque, the cutter is thrown out, causing it to hit the work surface. The higher the impact force, the larger the layer removed from the surface.

The advantage of mechanical cleaning methods is their use where it is impossible to use dusty, wet and expensive sandblasting and hydro-sandblasting processes.
Surface notching is effective, increasing the area of ​​stress transfer. However, the use of impact tools (perforators, jackhammers) for removing the film and subsequent notching should be excluded, due to possible damage to the top layer of concrete of the joining surface.

The disadvantages of mechanical methods for preparing the concrete surface include the following:
- the possibility of cleaning only after the concrete has reached a strength of 1.5 MPa leads to long technological interruptions;
- only the top layer of the cement film is removed and the pores of the concrete are not opened;
- possible occurrence of microcracks;
- dust formation requires cleaning with an industrial vacuum cleaner;
-high cost of equipment and labor intensity;
- the complexity of organizing quality control of work.

2. The method of chemical milling is based on the sequential treatment of the concrete surface with a brush, roller or spray with water-based compounds made from complex polyfunctional acids and bases (without the use of polymers). Moreover, the compositions do not contain hydrochloric, acetic, citric, orthophosphoric acids or substances that destroy concrete.

Chemical milling completely eliminates the use of manual mechanical cleaning, including in places inaccessible to mechanical milling. This method effectively dissolves cement film, opens pores and increases by 1.5-3 times the adhesion strength of layers of monolithic concrete, cement, gypsum and magnesium screeds, penetrating waterproofing cement materials, cement, epoxy, polyurethane and acrylate self-leveling floors, as well as joint sealants, plasters, tile adhesives, interior and facade cladding made of natural and artificial stone.

Chemical milling compounds are odorless and have no harmful effects on humans or the environment.

The composition “Lepta Himfrez” based on inorganic acids is used for chemical milling, cleaning from efflorescence (white spots on the facade), cement mortar residues, cement laitance and atmospheric pollution for concrete and brick surfaces before applying penetrating waterproofing, plaster, paint.

Advantages:
1. Increases the depth of penetration of chemically active particles of waterproofing materials.
2. Cleans the surface from efflorescence.
3. Removes cement film without causing damage to concrete.
4. Increases the adhesion of old concrete to new.
5. Eliminates the need for mechanical cleaning of concrete.
6. Does not change the color or appearance of the surface.
7. No smell.
8. Safe for people.

The website outlines the basics of electroplating technology. The processes of preparation and application of electrochemical and chemical coatings, as well as methods for monitoring the quality of coatings, are discussed in detail. The main and auxiliary equipment galvanic workshop. Information is provided on mechanization and automation of galvanic production, as well as sanitation and safety precautions.

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