EP3414020A1 - Method and system for covering inner walls of a cavity with a protective layer made of anti-corrosion wax or anti-corrosion agent - Google Patents
Method and system for covering inner walls of a cavity with a protective layer made of anti-corrosion wax or anti-corrosion agentInfo
- Publication number
- EP3414020A1 EP3414020A1 EP17703199.4A EP17703199A EP3414020A1 EP 3414020 A1 EP3414020 A1 EP 3414020A1 EP 17703199 A EP17703199 A EP 17703199A EP 3414020 A1 EP3414020 A1 EP 3414020A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mist
- cavity
- protective agent
- corrosion
- outlet opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005260 corrosion Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000011241 protective layer Substances 0.000 title claims abstract description 7
- 239000003595 mist Substances 0.000 claims abstract description 186
- 239000003223 protective agent Substances 0.000 claims abstract description 75
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000010410 layer Substances 0.000 claims abstract description 8
- 230000007797 corrosion Effects 0.000 claims description 70
- 239000003112 inhibitor Substances 0.000 claims description 40
- 239000011814 protection agent Substances 0.000 claims description 18
- 239000012530 fluid Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000000889 atomisation Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 239000001993 wax Substances 0.000 description 32
- 238000005507 spraying Methods 0.000 description 13
- 230000001681 protective effect Effects 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000003755 preservative agent Substances 0.000 description 3
- 230000002335 preservative effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002663 nebulization Methods 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007786 electrostatic charging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 235000013490 limbo Nutrition 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
- B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
- B05B12/06—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery for effecting pulsating flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2259/00—Applying the material to the internal surface of hollow articles other than tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2501/00—Varnish or unspecified clear coat
- B05D2501/10—Wax
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0218—Pretreatment, e.g. heating the substrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
Definitions
- the invention relates to a method for covering inner walls of a cavity with a protective layer of corrosion protection wax or a wax-based corrosion protection agent according to the preamble of claim 1, in particular for use on vehicle bodies and components for vehicle bodies.
- the invention further relates to a system for carrying out the method according to the preamble of claim 1.
- Generic methods are used in vehicle construction to protect body parts and in particular cavities of bodies and their attachments such as flaps, doors and the like against environmental influences. Typically, this is done by either applying corrosion protection wax to the surfaces concerned by spraying or by flooding the cavities with anticorrosion wax and then removing excess protective wax to cover the surfaces concerned.
- the object of the invention is to provide a technically uncomplicated method and a system provided for this purpose, by means of which a reliable covering of inner surfaces of a cavity is possible with low use of protective agent.
- Corrosion protection wax or wax-based corrosion protection agent is brought into a misted form (protective agent mist) by means of a mist generator and fed through an outlet opening to the cavity to be preserved.
- the protective agent mist is deposited on the inner walls of the cavity and here forms a corrosion protection agent layer.
- the corrosion inhibitor used in the method according to the invention can be formed as a corrosion protection wax and as such has a wax content (mineral oil-based wax / paraffin) of at least 50 wt .-%.
- wax-based corrosion inhibitors having a lower wax content of at least 5% by weight and preferably between 5% by weight and 15% by weight are also usable.
- Such corrosion inhibitors may in particular also contain a proportion of between 15% by weight and 30% by weight of a polyester resin. This gives the spent protective layer after drying through a high thermal stability.
- the term of the corrosion inhibitor includes both classic corrosion protection wax with a high wax content and corrosion inhibitors with a lower wax content.
- a mist atmosphere of corrosion inhibitor and gas is generated or such a mist atmosphere is supplied to the cavity.
- This consists of gas, especially air, as well as the finest droplets of the corrosion inhibitor. These are sufficiently small atomized to be hoverable in the surrounding air.
- the average droplet size of the droplets of the anticorrosion agent in the mist is for this purpose preferably ⁇ 60 ⁇ , in particular preferably ⁇ 30 ⁇ or even ⁇ on average.
- the production of such a protective agent mist takes place by means of a suitable mist generator.
- This may, for example, be a one-substance nozzle to which the corrosive agent is supplied at high pressures. This will be explained in more detail later.
- a two-fluid nozzle is considered advantageous, since at lower pressures also very small droplets can be generated.
- All mean droplet diameters referred to in this document are number average diameters, and therefore refer to the sum of the droplet diameters divided by the number of droplets.
- mist is also known as unwanted side effect from wax spraying, as can be seen for example from DE 102009052089 A1.
- the discharge process for this purpose is such, in particular by the choice of the nozzle used and the pressure at which the corrosion inhibitor and possibly compressed air is supplied, that at least 50%, preferably at least 80%, of the generated droplets has a size to does not deviate more than 20% from the stated mean droplet size.
- the mist atmosphere of the protective agent mist which is introduced according to the invention for the purpose of microwavenbe- coating in the cavity, unlike spraying the corrosion inhibitor for the vast majority not directly on the walls of the cavity down, but initially distributed in the cavity and then beats also on such surfaces down, which would not be directly accessible from the outlet opening by spraying.
- the size of the droplets and the exit velocity and possibly also the influence of the resulting mist are preferably chosen so that at least 50% of the volume flow of the introduced protective agent takes 5 seconds or more to produce this mist atmosphere until the droplets have deposited on the walls ,
- the fog atmosphere thus remains time to distribute itself largely homogeneously in the cavity.
- the type of precipitate of the protective agent and the formation of layers can be influenced. Furthermore, it is also possible to influence the precipitate by electrostatic charging of the protective means before or during the discharge and / or charge of the walls. Depending on the nature of the protective agent, the solidification can be effected by an elevated temperature and a reduced temperature of the protective agent. Depending on the anticorrosion agent used, chemical drying, radiation drying or drying by air flow is also possible.
- the protective agent mist can remain at the conclusion of the process in the cavity or be sucked out of it.
- the wax preservatives commonly used today for spraying or flooding in vehicles already come into question.
- the corrosion protection wax with the brand name Eftec Efcoat WH 320 AI called, which can be used here.
- Further examples of anticorrosive agents that can be discharged by means of the method according to the invention are the anticorrosion agents available under the brand names Anticorit CPX 3373 LV and Anticorit DS 329 DE.
- Anticorit CPX 3373 is a wax-based corrosion inhibitor with a wax content of about 5 to 15 wt .-% and a polyester resin as an additive in an amount between 15 wt .-% and 30 wt .-%.
- such wax-based corrosion protection agents have proven to be particularly suitable for nebulization.
- a corrosion inhibitor further comprises a filler, in particular in a proportion of between 15 wt .-% and 25 wt .-% and / or additives such as anti-corrosion additives in a proportion of 10 wt .-% to 20 wt .-%.
- the viscosity of the corrosion inhibitor used is preferably below 750 mPas, in particular preferably below 600 mPas. Such low viscosity corrosion inhibitors have been found to be advantageous to produce the desired protective agent mist.
- the droplets of the protective agent mist can emerge from the outlet opening at a speed ⁇ 10 m / s, in particular ⁇ 5 m / s, preferably 2 ⁇ m / s, in particular preferably ⁇ 0.5 m / s.
- the formation of a mist atmosphere is favored. Too high speeds can cause that, despite the small droplet size too large a proportion of the droplets hits directly on a flat wall of the cavity and thus can no longer contribute to the formation of a mist atmosphere.
- the speed of the discharged droplets is not completely uniform.
- the two-fluid nozzles preferably used for the generation of mist for example a nozzle of the type Miniquest from the company Düsen-Schlick GmbH from Untersiemau / Coburg, produce droplets of different speeds. Usually, in a center of the resulting cloud of fog, the speed is highest.
- the speed values given above do not take into account these particularly fast droplets. They refer to those 80% of the volumetric flow rate produced by the slowest droplets.
- a gas is supplied to the cavity at a deviating second introduction point in order to influence the protective agent mist in the cavity with respect to its flow direction and / or by the speed of the protective agent mist to reduce.
- This gas which may be in particular air, is preferably supplied through a second opening in walls of the cavity, wherein this opening is in particular preferably arranged at a location opposite to the mist generator of the cavity.
- the purpose of the supply of gas is, in particular, to produce a type of gas or air cushion capable of preventing the direct impact of droplets of the protective agent mist on one of the walls of the cavity.
- a backpressure counter to the spread of the droplets is produced which slows the droplets to become part of a mist atmosphere.
- a particularly low volume flow in the cavity is considered to be particularly advantageous, in particular a volume flow of the corrosion inhibitor of less than 200 g / minute, preferably less than 100 g / minute, particularly preferably less than 50 g / minute.
- a volume flow of the corrosion inhibitor of less than 200 g / minute, preferably less than 100 g / minute, particularly preferably less than 50 g / minute.
- the supply of the protective agent mist can take place at several points or at changing points within the cavity to be preserved.
- the supply of the protective agent mist can also be effected by means of a plurality of mist generators, which are arranged at different locations within the cavity to be preserved and / or are arranged in different directions relative to the cavity to be preserved.
- the introduction of the protective agent mist may be sufficient at only one point of the cavity, since the protective agent mist is distributed in the cavity, a particularly good and rapid distribution of the mist can be promoted by said additional measures.
- the mist atmosphere can be created from both ends.
- a movable within the cavity outlet opening which discharges at different locations, with only one outlet opening a fairly homogeneous fog atmosphere can be created.
- a plurality of outlet openings which point in different directions, it is particularly well ensured, in particular in conjunction with a common movement of these outlet openings through the cavity, that the mist atmosphere also reaches hard-to-reach surface areas.
- the supply of protective agent mist over several mist generators can be done for example by using a two-fluid nozzle in combination with the above-mentioned supply of gas.
- the protective agent mist is distributed basically independently in the cavity largely homogeneous. However, since short cycle times are desired depending on the application, it may be particularly advantageous to selectively move the protective agent mist through a local overpressure or negative pressure in the cavity. This can be done for example by the introduction or suction of air at an opening of the cavity, either by a separate from the outlet pressure opening of the system for cavity preservation or through the outlet opening itself. By periodically repeated pressure increases or decreases can cyclical movement of the protective agent mist in Cavity are generated, through which a particularly favorable precipitation behavior of the protective agent is achieved on the surface.
- a distribution of the droplets of the protective agent mist can be positively influenced if the introduction takes place in a pulsed manner.
- This is understood to mean that the parameters of the generation of mist by the at least one mist generator change repeatedly.
- the pressure of the air supplied to the mist generator could periodically fluctuate.
- the average frequency of the pulsed operation is preferably between 0.1 Hz and 5 Hz.
- mist generators which operate in such a way that alternately a first of the two mist generators and a second of the two mist generators discharge the relatively larger volume flow.
- two spaced-apart and separate controllable mist generators are accordingly provided which, in exchange, discharge the respective larger volume flow of anticorrosive agent. This also makes it possible to generate a periodically recurring movement of the mist, which causes a quick and homogeneous distribution of the mist.
- a typical workpiece, which is protected against corrosion by the methods according to the invention, is the partial area of a body with an elongate cavity.
- the protective mist it is possible to allow the protective mist to escape through the outlet opening in alignment with the main extension direction of the cavity.
- the protective mist can also escape in a direction out of the outlet opening, which is angled relative to the main extension direction of such a cavity.
- a similar effect can be achieved by providing an influence after exiting the mist through the outlet opening.
- the protective agent mist can be selectively influenced after leaving the outlet opening with regard to its direction of movement, in particular by supplying air from different air nozzles from the outlet opening. By their mutually angled orientation these air nozzles are also able to effect such a helical movement of the mist atmosphere.
- Fog nozzles are already known from other areas of the prior art.
- a possible embodiment provides that only the anticorrosive agent is pressurized and is atomized through a narrow single-fluid nozzle.
- the supply of the liquid corrosion inhibitor is in this case preferably at a pressure of at least 20 bar, more preferably at least 60 bar. Of particular advantage are even higher pressures, in particular from about 100 bar. Although, by clearly exceeding this value, the nebulization can be positively influenced. Beyond 120 bar, however, the expense of handling the protective agent before discharge is so great that it should usually be disregarded.
- An alternative embodiment provides that a mixing of anticorrosion agent and air, which are each pressurized, takes place before or at the outlet of the protective agent mist.
- the pressurized air ruptures the liquid supplied corrosion inhibitor and thereby generates the mist. It has been found that this technique allows fog generation with sufficiently small droplet size even at comparatively low pressures. Thus, in this case it is preferable to work with a supply overpressure of between 1 bar and 3 bar for the anticorrosive agent and between 1 bar and 5 bar for the air. Due to the low pressures, the total cost of the process is lower than when using single-fluid nozzles, where higher pressures are needed.
- the two-fluid nozzle is supplied with air in such a way that it is accelerated to more than 100 m / s before discharge, ideally to about 250 m / s.
- the mentioned pressures and speeds ensures a very fine atomization. It can produce droplet sizes with a mean droplet diameter of 10 ⁇ or less, which is considered to be ideal for the formation of a quiet fog atmosphere in the cavity.
- the fog that can be generated thereby forms a fine mist atmosphere, which is reflected in the form of a thin and very homogeneous protective layer on the walls of the cavity.
- mist generation provides a high-frequency oscillating actuator, such as a piezoelectric actuator or another form of ultrasonic atomizer.
- mist generators and outlet openings may additionally be provided that they have a rotatable component, so that the outlet openings is during the exit of the corrosion protection agent in a rotational movement, which serves the homogeneous distribution of the corrosion inhibitor.
- the outlet opening may be connected upstream of a mist production chamber.
- the mist generator can be designed to generate the protective agent mist in the mist production chamber. It may be provided for conveying the protection agent spray to the outlet conveyor.
- the upstream mist production chamber serves to generate a homogeneous mist even before introduction into the cavity to be preserved.
- a conveyor such as a pump for conveying the protection agent mist or to generate an overpressure in the mist production chamber, this mist is supplied in the homogenized form of the cavity.
- the method may find application for supplying the protective agent mist in a cavity between walls of a double-walled hollow body. It may also find application for supplying the protective agent mist in a cavity, the inner walls are covered at least partially by other wall sections, starting from the positioning of the outlet opening within the cavity. Even surfaces of curved or angled cavities are to be provided by means of the described method advantageously with corrosion inhibitors. In particular, in such designs can be achieved by the protective agent mist better results than by spraying protective wax.
- the system has a working position at which a workpiece with a cavity to be preserved can be positioned. It has a supply device for supplying a corrosion inhibitor in the cavity.
- the supply device has a mist generator with outlet opening which can be positioned on or in the cavity to be preserved in such a way that the corrosion protection agent can be introduced into the cavity in atomized form (protective agent mist).
- the system may have air nozzles for introducing air for movement of the generated protection agent mist within the cavity.
- the system may have at least one pressure generator, by means of which in a partial region of the cavity a negative pressure or an overpressure can be generated.
- the pressure generator may be provided with a control device, is generated by the periodically changing pressure within the cavity.
- the system is designed to produce a protective agent mist of the type described above. Furthermore, the system may have further to the described method as well as in connection with the embodiments mentioned components.
- FIGS. 1 and 2 show an exemplary workpiece with a cavity whose surfaces are to be provided with anticorrosion agent.
- FIG. 3 shows the introduction of atomized corrosion protection agent into the cavity through an outlet opening at an end face of the workpiece.
- Fig. 4 shows the cavity after the anti-corrosion agent has deposited on the walls.
- Fig. 5 shows a possible structure of a mist generator in the form of a mist nozzle, through which the corrosion inhibitor can be introduced and is thereby atomized to mist.
- Fig. 6 shows a variant in which the mist discharge is improved by movement of the outlet opening.
- FIGS. 7a and 7b show a variant in which a movement of the protective agent mist is achieved by targeted generation of overpressure and / or negative pressure in the hollow body.
- FIG. 10 shows a variant in which the generation of mist takes place in a mist production chamber not belonging to the workpiece and the mist produced is only subsequently supplied to the cavity of the workpiece.
- FIG. 1 and 2 show an exemplary workpiece 10, which may be, for example, a portion of a sill of a motor vehicle.
- FIG. 1 shows a sectional view of As can be seen, a cavity 12 of this sill is limited not only by a cylindrical outer wall 20, but also by partition plates 22.
- the aim of the method described here is to cover the surfaces within the cavity with corrosion protection wax or wax-based corrosion inhibitor.
- said partition plates 22 make it impossible to reach all surfaces starting from an end face region 14 of the cavity 12 by spraying anti-corrosion agent.
- FIG. 3 shows how, in the method according to the invention, an applicator 30 with a mist nozzle (not shown in the FIGURE) with an outlet opening 32 is inserted into the cavity 12 at the end.
- the protective agent mist 40 is introduced into the cavity 12.
- the protective agent mist 40 consists of fine droplets with a mean diameter of less than 60 ⁇ .
- the protective agent mist 40 is distributed within the cavity 12 and is deposited on the surfaces of the outer wall 20 and the partition plates 22 down.
- the introduced mist is to be distinguished from the spraying, which is already known in the field of cavity preservation.
- the mist generation according to the invention and the known spraying agree that the liquid cavity preservative in the form of small droplets, which are introduced into the cavity.
- the average droplet diameter is smaller, preferably less than 30 ⁇ , particularly preferably less than 10 ⁇ , and that the droplets at least for the most part do not strike directly on a wall of the hollow body and remain there, but a mist atmosphere form within the hollow body, which moves only very slowly within the hollow body.
- the vast majority of the cavity preservative introduced into the cavity is still not in wall contact for 5 seconds after insertion.
- FIG. 4 shows the cavity with a protective agent layer 50, which has deposited on the walls.
- a protective agent layer 50 in areas 52, which would not have been reached directly from the outlet opening 32 by spraying, but only by the tendency of the protective agent mist 40 to homogeneously distribute in the cavity 12 and precipitate on the surfaces.
- FIG. 5 shows by way of example a single-substance nozzle forming the mist generator 31. This can be provided at the end in the applicator 30. It has a thin nozzle channel 34, the opening of which defines the outlet opening 32, wherein for the purpose of tearing the corrosion protection agent into fine droplets, a sharp-edged design is provided at edges 36 of this outlet opening 32.
- the anticorrosion agent is supplied through a supply channel 38 under high pressure. The higher the pressure, the finer the resulting droplets of the corrosion inhibitor. It is particularly advantageous if the corrosion protection agent in the channel 38 has a pressure between 80 and 120 bar.
- Figure 6 shows again, similar to Figure 3, the introduction of the corrosion inhibitor in the cavity.
- the peculiarity lies in the fact that in the manner illustrated by the arrow 2, the outlet opening 32 is displaced within the cavity.
- an even more homogeneous distribution of the mist can be effected.
- the required time can be shortened, which it takes until the mist has been homogeneously distributed. This serves to achieve short cycle times.
- pressure channels 70, 72 are respectively connected to the two opposite end regions 14, 16 of the cavity 12. These make it possible to specifically create an overpressure or a negative pressure in the areas 14, 16. In this way, in turn, the cloud of mist 40 can be selectively moved back and forth within the cavity 12, as is illustrated by the arrow 4a, 4b. In particular, the complete coverage of the bulkhead plates 22 with anticorrosion agent is thereby promoted.
- the pressure channel 72 on the opposite side of the nozzle may also be advantageous already during the introduction of the cloud of mist, since it allows to create by introducing mist droplets through the applicator 30 at the same time introducing air to the pressure channel 72 an air cushion, which prevents that an excessive proportion of the droplets, due to their exit velocity, is deposited directly on a wall of the cavity 12.
- FIG. 8 shows a design in which, in addition to the applicator 30, two air nozzles 60 are introduced in the end region of the cavity, these air nozzles each defining an exit direction of the air which does not extend only in the main extension direction 1 of the cavity 12, but in each case in a clockwise or counterclockwise direction both are angled counterclockwise.
- a helical twist in the mist 40 can be generated, which is a kind of a kind of screw the mist causes in the cavity and thereby in turn favors the coverage of difficult to access areas.
- Figure 9 shows that similar can also be achieved in that the mist generator itself has two outlet openings 32a, 32b, which are angled in opposite directions in order to produce the desired twist can.
- the applicator 30 can rotate as a whole.
- the embodiment according to FIG. 10 has a clear difference.
- a fog generating chamber 80 belonging to the plant and not to the workpiece is provided, into which the protective agent mist 40 is produced by means of a mist nozzle 31. From here, the mist is fed through a channel 90 to the actual cavity. This can be done via a pump 92 or for example, in addition to the protection agent mist 40 via a separate channel, an overpressure in the mist production chamber 80 is caused, which pushes the protection agent mist 40 through the channel 90 into the workpiece.
- Fig. 11 shows a further embodiment in which, unlike the preceding embodiments, at two ends of each with a protective agent layer cavity, a respective mist generator 31A, 31B are provided, which are each designed as dual-fluid mist nozzles.
- these may be nozzles of the type Mod. 970/0 S4 of the company Düsen-Schlick GmbH from Untersiemau / Coburg. These nozzles are inserted in the case of the embodiment of FIG. 11 through lateral openings of the workpiece.
- the mist generators 31A, 31B are supplied with corrosion inhibitors and air via lines 33A, 33B. Only a small volume flow of corrosion inhibitor of about 50 ml / min is supplied. The actual atomization at the outlet nozzle of the mist generator 31A, 31B takes place with the air flowing in at a speed of about 250 m / s and at inflow pressures of 2 bar in the case of air and 3 bar in the case of the corrosion inhibitor. The result is the generation of a mist with an average droplet size of about 10 ⁇ .
- the cloud of fog escapes from the mist generator in the form of a cone, with the velocity in the center of this cone being about 16 m / s and dropping rapidly to less than 10 m / s outwards.
- the introduction can take place, for example, in the phase of 2 to 3 seconds in length, followed by a short phase of 1 to 3 seconds with deactivated mist generator.
- FIGS. 14 to 16 illustrate this with an example with two mist generators 31A, 31B.
- mist is generated by the fog generator 31B shown in the figures, as shown in FIG. 14.
- the mist production stops here and the mist generator 31A shown in the figures releases mist of anti-corrosion agent.
- the two fog clouds brake each other.
- the discharge is in turn continued with a discharge operation on the left mist generator 31B. It gradually sets the desired dense fog cloud 40 of the finest droplets, which then settle on the walls in the manner already described.
- mist generators are illustrated in the embodiment of FIGS. 14 to 16, even the use of only one mist generator has shown that the iterative or pulsating emission of protective agent mist - ie the repeated activation and deactivation of the release of the protective agent mist - is an improvement over continuous delivery Forming the mist atmosphere of corrosion inhibitor and leads to a smaller proportion directly against walls of bouncing droplets.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Nozzles (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16154796.3A EP3205407B1 (en) | 2016-02-09 | 2016-02-09 | Method and installation for covering internal walls of a cavity with a protective layer made of corrosion protecting wax |
PCT/EP2017/052932 WO2017137520A1 (en) | 2016-02-09 | 2017-02-09 | Method and system for covering inner walls of a cavity with a protective layer made of anti-corrosion wax or anti-corrosion agent |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3414020A1 true EP3414020A1 (en) | 2018-12-19 |
EP3414020B1 EP3414020B1 (en) | 2020-04-08 |
Family
ID=55411176
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16154796.3A Active EP3205407B1 (en) | 2016-02-09 | 2016-02-09 | Method and installation for covering internal walls of a cavity with a protective layer made of corrosion protecting wax |
EP17703199.4A Active EP3414020B1 (en) | 2016-02-09 | 2017-02-09 | Method for covering internal walls of a cavity with a protective layer made of corrosion protecting wax or other wax based corrosion protecting material |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16154796.3A Active EP3205407B1 (en) | 2016-02-09 | 2016-02-09 | Method and installation for covering internal walls of a cavity with a protective layer made of corrosion protecting wax |
Country Status (4)
Country | Link |
---|---|
US (1) | US10870124B2 (en) |
EP (2) | EP3205407B1 (en) |
CN (1) | CN108698066B (en) |
WO (1) | WO2017137520A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3670001B1 (en) * | 2018-12-18 | 2021-07-28 | IPR-Intelligente Peripherien für Roboter GmbH | Method for cavity preservation, mixing nozzle unit and cavity preservation device with such a mixing nozzle unit |
DE102020127076A1 (en) * | 2020-01-20 | 2021-07-22 | Jens-Werner Kipp | Process for thin coating of internal surfaces of through holes |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB867303A (en) | 1958-02-24 | 1961-05-03 | Shell Res Ltd | Improvements in or relating to methods of inhibiting corrosion in the cargo tanks ofmarine vessels |
US3227572A (en) * | 1962-06-06 | 1966-01-04 | Chevron Res | Pipe repair process |
US3202363A (en) * | 1963-07-01 | 1965-08-24 | Aro Corp | Automatic fogspray device |
US3488213A (en) * | 1965-05-20 | 1970-01-06 | Schlitz Brewing Co J | Method and apparatus for applying a coating to the interior surface of a hollow article |
US3673463A (en) * | 1969-06-30 | 1972-06-27 | Gourdine Systems Inc | Methods and apparatus for electrogasdynamic coating |
DE3066513D1 (en) * | 1979-10-25 | 1984-03-15 | Sumitomo Light Metal Ind | Method, apparatus and spray nozzle for coating the inner surface of long tubes of small diameter |
DE3006908C2 (en) * | 1980-02-23 | 1985-04-18 | Fritz 8942 Ottobeuren Noack | Device for the corrosion protection of metal surfaces |
JPS5813226B2 (en) | 1980-05-29 | 1983-03-12 | 株式会社 日本プラントサ−ビスセンタ− | Lining method for pipe inner wall surface |
US4314670A (en) * | 1980-08-15 | 1982-02-09 | Walsh William A Jun | Variable gas atomization |
GB2123516B (en) | 1982-04-30 | 1986-02-05 | Hakko Co | Lining old underground pipes |
JPS58189074A (en) | 1982-04-30 | 1983-11-04 | Hakko Co Ltd | Method for repairing inner surface of existing pipe line |
GB2123917B (en) | 1982-04-30 | 1986-02-12 | Hakko Co | Lining underground pipes |
JPS5952570A (en) | 1982-09-20 | 1984-03-27 | Nissan Motor Co Ltd | Coating method |
JPS59150578A (en) | 1983-02-18 | 1984-08-28 | Hakko Co Ltd | Repairing method for inner surface of existing pipe |
DE3910179C1 (en) * | 1989-03-29 | 1990-03-29 | J. Wagner Gmbh, 7990 Friedrichshafen, De | |
US5522930A (en) * | 1994-11-04 | 1996-06-04 | The Regents, University Of California | Method and device for producing and delivering an aerosol for remote sealing and coating |
DE10115463A1 (en) * | 2001-03-29 | 2002-10-02 | Duerr Systems Gmbh | Atomizer for a coating system and process for its material supply |
FI20080264L (en) * | 2008-04-03 | 2009-10-04 | Beneq Oy | Coating method and device |
DE102009052089A1 (en) * | 2009-11-05 | 2010-06-17 | Daimler Ag | Device for conserving cavities in automobile body, has reducer provided in area of connection for strongly reducing cross section of line of specific length, where reducer is fixed in connection by press fit, sticking, or welding process |
CN102601010A (en) * | 2011-03-30 | 2012-07-25 | 中国石油化工集团公司 | Natural gas pipe corrosion inhibitor coating device |
FR3014334A3 (en) * | 2013-12-05 | 2015-06-12 | Renault Sa | NOZZLE OF A PLATE OF INJECTION OF WAX |
-
2016
- 2016-02-09 EP EP16154796.3A patent/EP3205407B1/en active Active
-
2017
- 2017-02-09 WO PCT/EP2017/052932 patent/WO2017137520A1/en active Application Filing
- 2017-02-09 CN CN201780010667.1A patent/CN108698066B/en active Active
- 2017-02-09 US US16/070,447 patent/US10870124B2/en active Active
- 2017-02-09 EP EP17703199.4A patent/EP3414020B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2017137520A1 (en) | 2017-08-17 |
EP3205407B1 (en) | 2019-09-25 |
CN108698066A (en) | 2018-10-23 |
US20190022686A1 (en) | 2019-01-24 |
EP3414020B1 (en) | 2020-04-08 |
US10870124B2 (en) | 2020-12-22 |
EP3205407A1 (en) | 2017-08-16 |
CN108698066B (en) | 2021-10-29 |
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