CA1238587A - Metallic pipe provided with protection against corrosion and a method for the production thereof - Google Patents
Metallic pipe provided with protection against corrosion and a method for the production thereofInfo
- Publication number
- CA1238587A CA1238587A CA000490702A CA490702A CA1238587A CA 1238587 A CA1238587 A CA 1238587A CA 000490702 A CA000490702 A CA 000490702A CA 490702 A CA490702 A CA 490702A CA 1238587 A CA1238587 A CA 1238587A
- Authority
- CA
- Canada
- Prior art keywords
- layer
- metal
- intermediate layer
- metallic pipe
- synthetic material
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/08—Coatings characterised by the materials used by metal
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
ABSTRACT
A metallic pipe for use, for example, as a brake-line, a fuel-line or a line for motor vehicles, is provided with corrosion-protection against chemical or mechanical attack. The corrosion-protection consists of a plurality of layers, at least one of which layers is made of a metal or metal-alloy.
In order to provide a pipe of this kind with multilayer corrosion-protection, it is necessary to ensure that the individual layers adhere to each other, and that the pipe is sufficiently flexible to withstand a high degree of deformation. To achieve these objectives, a metal-alloy layer consisting of low-melting-point metals, be applied to the outer surface of the pipe. An intermediate layer, both sides of which are adapted to adhere, is applied over the aforementioned metal-alloy layer. At least one layer of a highly-resistant, thermoplastic or thermosetting synthetic material is then formed over the intermediate layer.
A metallic pipe for use, for example, as a brake-line, a fuel-line or a line for motor vehicles, is provided with corrosion-protection against chemical or mechanical attack. The corrosion-protection consists of a plurality of layers, at least one of which layers is made of a metal or metal-alloy.
In order to provide a pipe of this kind with multilayer corrosion-protection, it is necessary to ensure that the individual layers adhere to each other, and that the pipe is sufficiently flexible to withstand a high degree of deformation. To achieve these objectives, a metal-alloy layer consisting of low-melting-point metals, be applied to the outer surface of the pipe. An intermediate layer, both sides of which are adapted to adhere, is applied over the aforementioned metal-alloy layer. At least one layer of a highly-resistant, thermoplastic or thermosetting synthetic material is then formed over the intermediate layer.
Description
~23~
The invention relates to a metallic pipe which is provided with corrosion-protection against chemical and/or mechanical attack, the said corrosion-protection consisting of a plurality of layers, at least one of which is a layer made of a metal or a metal-alloy;
and to a method for applying the layers.
Metallic, corrosion-protected pipes of this kind are intended to remain corrosion-resistant even after being deformed and, during use, under stress caused by impact, shock and bending. Such properties are needed for motor-vehicle parts, for example. It is known to provide a galvanized part with a chromate coating following a coating on non-wa~ synthetic material, followed in turn by a heat-treatment. The known me-thod leads to a multilayer protective coating. See for example, German Patent No. 20 46 ~9 or ~.S. Pa-tent No. 3,808,057.
It is also known to apply protective coatings to metal objects using a reducing agent and compounds of aqueous dispersion containing hexavalent chrornium, a dispersion being used which is a hydrophobic resin of a non-waY~ nature, which may be hardenable or thermoplastic, is added. See German Auslegeschrif-t AS 12 ~6 20 357.
In contrast to this, it is the purpose of the present invention to provide a metal object with multilayer corrosion protection in which mutua] adhesion of indivldual layers is sufficiently flexible to withstand a high degree of deformation, and which e~hihits still greater resistance to corros:Lon.
According to the invention, this purpose is accomplishecl by first applying a metal-alloy layer, consisting of low-melting-point metals, to the surface to be protecter~. Next, an intermediate layer, both sicles of which are aclapted to adhere, is appli.ed over the metal-alloy layer. Then, at least one layer of A highly corrosion-resistant, thermoplastic or thermosetting synthetic material is formed on the intermediate layer. Multilayer corrosion-protection o this ~ind adheres firmly to the base (the metal surEace to be protected), while the individual layers adhere firmly to each other, said layers being e:tremely flexible and ~.,~
35~
~ 2 able to withstand considerable deformation, as in pipe-bending, for example. Another advantage of the protection is its great resistance to base-metal corrosion tests according to DIN 50018/2.0 S
(intensified industrial atmosphere) and ASTM-sll7 (salt-spray test). This corrosion-protection coating e~hibits homogeneous behaviour with appropriate resilient adjustment of its components.
These and other beneficial objects of the invention may be achieved by providiny on a metal surface to be protected: a metal layer applied to the surface; an intermediate layer, botn sides of which are adapted to adhere, applied over the layer of metal;
and at least one layer of a highly resistant, thermoplastic or thermoset-ting synthetic material formed on the said intermediate layer.
These and other beneficial objects of the inventi.on may also be achieved by providing on a metal surface to be protected:
a metal or metal-alloy layer, consisting of low-melting-point metals, applied to the surface; a layer of chromate applied over the metal or metal-alloy layer; an intermediate layer, both sides of which are adapted to adhere, applied over the chromate layer;
and at least one layer of a highly resistant, thermoplastic or thermosetting synthetic material is formed on the said intermedi.ate layer.
In view of the different mel-ting ranges and temperatures at wh:Lch the Eilms are formed, the invention may be carried out .Ln such a manner that, in the case o~ a metal-alloy layer made oE
low-mel-ting-point metals, the intermecliate layer is appli0d as a short-te.rm heat-insulat:Lng and barrier layer, while the hiyher-melt:l.ny-point, h:Lyhly resistant, thermoplastic or thermosettiny synthet:Lc material is appl:Led as the outermost layer.
An important advantaye is that the in-termediate layer makes it possible to apply hiyh-meltiny-point synthetic or thermosetting materials, which need higher temperatures to react, to low-melting-point metal alloys. During the application of the synthetic material, there is no liquating of the metal alloy and accumulations of the metal alloy, with the formation of Eree zones ~.
~3~S~3~7 on the metal object, are avoided. In this case, the intermediate layer acts mainly as a barrier-layer, preventing the metal alloy from coalescing. After the synthetic material has been applied, the intermediate layer effects a particularly intimate union between the synthetic material and the rnetal alloy. These properties are eYhibited by mi~.ed polymers, for example, synthetic resins in which adhesion is also present at high temperatures.
According to one embodiment of the invention, an advantageous metal alloy is a layer of a lead--tin alloy, since this is soft, fle~ible and economically viable. The use of a lead-tin alloy is also supported by the range of equipment available in this field.
The abovementioned alloy is always effective. However, the best results are obtained when it comprises, for example, 60 parts of lead and 40 parts of zinc. This composition is economical and is also safe and reliable for personnel processing lead.
Moreover, i-t has a relatively low melting point, thus saving power during processiny.
In the processing of such low-melting-point alloys, a layer of the metal alloy about a to lO ~Im in thickness is sufficient to form an initial corrosion-retardant. In practice, a uniform layer of this thickness is easy to apply and withstands subsequent deformation of the metal object.
In another embod:iment, a :Layer oE zinc may be applied, which layer desirably consists of yalvanically cleposited zinc. ~ccording to another aspect of the invention, :Lt is desirable that the intermediate layer adhere well to -the unclerlying metal, metal-alloy or chromate layer. Such an :Lntermecl.Late layer ensures the desired adhesion anfl, at the same time, const:Ltutes a dense, homogeneous sur~ace, with which the desired barrier-effect is associated.
E'urthermore, in conjunction with the metal or metal alloy, the said intermediate layer is sufficiently elastic to withstand higher degrees of deformation without cracking or even peelin~.
qlhe union between the metal alloy and the intermediate layer is substantially promoted if the temperature at which the inter-' :-1~3~35~37 mediate-layer film is formed is lower than the melting point of the underlying metal-alloy layer. Such temperature conditions also prevent the me-tal alloy from coalescing.
With respect to the relationship between the intermediate layer and the layer of synthetic material, it is desirable that the intermediate layer be highly resilient and adhesive, as compared with the layer of synthetic material.
The resistance of the metallic object to corrosion may be increased by arranging additional layers of highly-resistant synthetic material upon the intermediate layer.
According to the invention, the build-up of layers is achieved in the following manner. The metal or metal-alloy layer is applied from the molten phase, mechanically or galvanically, in a continuous operation. The intermediate layer, comprising a primer, is applied by flow-coating or by spraying from a solvent-phase or dispersion-phase or electrostatically Erom the solid phase.
The synthetic material is applied by flow-coating, by spraying from a solvent-phase or dispersion-phase or electrostatically Erom the solid phase.
Themetal-alloy layer is applied at a temperature of about 190 to 235 C., depending upon operating conditions.
An economical operating process is, therefore, based upon the highly resistant synthetic material being stoved at about 240 to 270C., being dried and melted onto the underlying lntermediate layer.
The method according to the invention is particularly suitable for metal objects in the Eorm oE metal pipes, especially pipes macle oE steel, used for e~ample, as brake-lines, fuel lines or a~ hyclraulic l:i.nes Eor motor vehlcles.
In order that the :Lnvention may be reacdily understood, several embodiments thereof will now be described in detail, by way of example, with reEerence to the accompanying drawings in which:
Fig. 1 is a cross-sectlon through a pipe with a single coating of synthetic materLal;
Fig. 2 is a cross-section through a pipe with a double coating ._ lZ3~35~3~
of synthetic material;
Fig. 3 is a cross-section throu~h a pipe with a chromate layer and a single coatin~ of synthetic material;
Fig. 4 is a cross-section through a pipe with a chromate layer and a double coating of synthetic material.
In the eYemplary embodiments, the metal object to be protectively coated is a seamless, welded or double-walled rolled pipe. Applied to this pipe is corrosion-protection against chemcial and/or mechanical attack in the form of a plurality of layers. In Fig.
1, a metal-alloy la~er 3 is applied conventionally to surface
The invention relates to a metallic pipe which is provided with corrosion-protection against chemical and/or mechanical attack, the said corrosion-protection consisting of a plurality of layers, at least one of which is a layer made of a metal or a metal-alloy;
and to a method for applying the layers.
Metallic, corrosion-protected pipes of this kind are intended to remain corrosion-resistant even after being deformed and, during use, under stress caused by impact, shock and bending. Such properties are needed for motor-vehicle parts, for example. It is known to provide a galvanized part with a chromate coating following a coating on non-wa~ synthetic material, followed in turn by a heat-treatment. The known me-thod leads to a multilayer protective coating. See for example, German Patent No. 20 46 ~9 or ~.S. Pa-tent No. 3,808,057.
It is also known to apply protective coatings to metal objects using a reducing agent and compounds of aqueous dispersion containing hexavalent chrornium, a dispersion being used which is a hydrophobic resin of a non-waY~ nature, which may be hardenable or thermoplastic, is added. See German Auslegeschrif-t AS 12 ~6 20 357.
In contrast to this, it is the purpose of the present invention to provide a metal object with multilayer corrosion protection in which mutua] adhesion of indivldual layers is sufficiently flexible to withstand a high degree of deformation, and which e~hihits still greater resistance to corros:Lon.
According to the invention, this purpose is accomplishecl by first applying a metal-alloy layer, consisting of low-melting-point metals, to the surface to be protecter~. Next, an intermediate layer, both sicles of which are aclapted to adhere, is appli.ed over the metal-alloy layer. Then, at least one layer of A highly corrosion-resistant, thermoplastic or thermosetting synthetic material is formed on the intermediate layer. Multilayer corrosion-protection o this ~ind adheres firmly to the base (the metal surEace to be protected), while the individual layers adhere firmly to each other, said layers being e:tremely flexible and ~.,~
35~
~ 2 able to withstand considerable deformation, as in pipe-bending, for example. Another advantage of the protection is its great resistance to base-metal corrosion tests according to DIN 50018/2.0 S
(intensified industrial atmosphere) and ASTM-sll7 (salt-spray test). This corrosion-protection coating e~hibits homogeneous behaviour with appropriate resilient adjustment of its components.
These and other beneficial objects of the invention may be achieved by providiny on a metal surface to be protected: a metal layer applied to the surface; an intermediate layer, botn sides of which are adapted to adhere, applied over the layer of metal;
and at least one layer of a highly resistant, thermoplastic or thermoset-ting synthetic material formed on the said intermediate layer.
These and other beneficial objects of the inventi.on may also be achieved by providing on a metal surface to be protected:
a metal or metal-alloy layer, consisting of low-melting-point metals, applied to the surface; a layer of chromate applied over the metal or metal-alloy layer; an intermediate layer, both sides of which are adapted to adhere, applied over the chromate layer;
and at least one layer of a highly resistant, thermoplastic or thermosetting synthetic material is formed on the said intermedi.ate layer.
In view of the different mel-ting ranges and temperatures at wh:Lch the Eilms are formed, the invention may be carried out .Ln such a manner that, in the case o~ a metal-alloy layer made oE
low-mel-ting-point metals, the intermecliate layer is appli0d as a short-te.rm heat-insulat:Lng and barrier layer, while the hiyher-melt:l.ny-point, h:Lyhly resistant, thermoplastic or thermosettiny synthet:Lc material is appl:Led as the outermost layer.
An important advantaye is that the in-termediate layer makes it possible to apply hiyh-meltiny-point synthetic or thermosetting materials, which need higher temperatures to react, to low-melting-point metal alloys. During the application of the synthetic material, there is no liquating of the metal alloy and accumulations of the metal alloy, with the formation of Eree zones ~.
~3~S~3~7 on the metal object, are avoided. In this case, the intermediate layer acts mainly as a barrier-layer, preventing the metal alloy from coalescing. After the synthetic material has been applied, the intermediate layer effects a particularly intimate union between the synthetic material and the rnetal alloy. These properties are eYhibited by mi~.ed polymers, for example, synthetic resins in which adhesion is also present at high temperatures.
According to one embodiment of the invention, an advantageous metal alloy is a layer of a lead--tin alloy, since this is soft, fle~ible and economically viable. The use of a lead-tin alloy is also supported by the range of equipment available in this field.
The abovementioned alloy is always effective. However, the best results are obtained when it comprises, for example, 60 parts of lead and 40 parts of zinc. This composition is economical and is also safe and reliable for personnel processing lead.
Moreover, i-t has a relatively low melting point, thus saving power during processiny.
In the processing of such low-melting-point alloys, a layer of the metal alloy about a to lO ~Im in thickness is sufficient to form an initial corrosion-retardant. In practice, a uniform layer of this thickness is easy to apply and withstands subsequent deformation of the metal object.
In another embod:iment, a :Layer oE zinc may be applied, which layer desirably consists of yalvanically cleposited zinc. ~ccording to another aspect of the invention, :Lt is desirable that the intermediate layer adhere well to -the unclerlying metal, metal-alloy or chromate layer. Such an :Lntermecl.Late layer ensures the desired adhesion anfl, at the same time, const:Ltutes a dense, homogeneous sur~ace, with which the desired barrier-effect is associated.
E'urthermore, in conjunction with the metal or metal alloy, the said intermediate layer is sufficiently elastic to withstand higher degrees of deformation without cracking or even peelin~.
qlhe union between the metal alloy and the intermediate layer is substantially promoted if the temperature at which the inter-' :-1~3~35~37 mediate-layer film is formed is lower than the melting point of the underlying metal-alloy layer. Such temperature conditions also prevent the me-tal alloy from coalescing.
With respect to the relationship between the intermediate layer and the layer of synthetic material, it is desirable that the intermediate layer be highly resilient and adhesive, as compared with the layer of synthetic material.
The resistance of the metallic object to corrosion may be increased by arranging additional layers of highly-resistant synthetic material upon the intermediate layer.
According to the invention, the build-up of layers is achieved in the following manner. The metal or metal-alloy layer is applied from the molten phase, mechanically or galvanically, in a continuous operation. The intermediate layer, comprising a primer, is applied by flow-coating or by spraying from a solvent-phase or dispersion-phase or electrostatically Erom the solid phase.
The synthetic material is applied by flow-coating, by spraying from a solvent-phase or dispersion-phase or electrostatically Erom the solid phase.
Themetal-alloy layer is applied at a temperature of about 190 to 235 C., depending upon operating conditions.
An economical operating process is, therefore, based upon the highly resistant synthetic material being stoved at about 240 to 270C., being dried and melted onto the underlying lntermediate layer.
The method according to the invention is particularly suitable for metal objects in the Eorm oE metal pipes, especially pipes macle oE steel, used for e~ample, as brake-lines, fuel lines or a~ hyclraulic l:i.nes Eor motor vehlcles.
In order that the :Lnvention may be reacdily understood, several embodiments thereof will now be described in detail, by way of example, with reEerence to the accompanying drawings in which:
Fig. 1 is a cross-sectlon through a pipe with a single coating of synthetic materLal;
Fig. 2 is a cross-section through a pipe with a double coating ._ lZ3~35~3~
of synthetic material;
Fig. 3 is a cross-section throu~h a pipe with a chromate layer and a single coatin~ of synthetic material;
Fig. 4 is a cross-section through a pipe with a chromate layer and a double coating of synthetic material.
In the eYemplary embodiments, the metal object to be protectively coated is a seamless, welded or double-walled rolled pipe. Applied to this pipe is corrosion-protection against chemcial and/or mechanical attack in the form of a plurality of layers. In Fig.
1, a metal-alloy la~er 3 is applied conventionally to surface
2 of the pipe, designated by the reference numeral 1, said layer
3 comprising, for e~ample, two low-melting-point metals. Lead and tin are preferably used as the low-melting-point metals in a 60:~0 alloying ratio. After layer 3 has solidified, an intermediate layer 5, e.g. a primer, is applied. The intermediate layer 5 consists of a bonding-agent system comprising a synthetic resin and containing, among other things, corrosion-inhibiting fillers. In -this case, the intermediate layer 5 acts as an adhesive and is therefore highly adhesive on the side facing metal-alloy layer 3. On the other side, the intermediate layer 5 adheres to a highly resistant, thermoplastic synthetic-material layer 6, which is now applied; as already indicatecl, this may be replaced by a thermosetting material. Polyvinyl-fluoride (PVF) and polyvinyl-difluoride (PVF2) are particularly suitable.
Metal-alloy layer 3 is about 4 to 10 ~m :ln th:lc]cness, thus providing a hlgh-speecl process. Intermedlate layer 5, i.e. the so-called primer, in the ~orm Oe a synthetic resin, is such that it adheres firmly to underlying metal-alloy layer 3.
In one particular exemplary embodlment, both intermecliate layer 5 and layer 6 Oe synthetic materlal are hi.ghly resilient, hi~hly aclhesive ancl heat resistant.
Accord:Lng to Fig. 2, an additional layer 6 of highly resistant synthetic material or highly resistant thermosetting material is provided. The application of an additional layer 6 does not require an additional intermediate layer.
~Z~3~35~'7 The advan-tages of the pipe pro-tected, according to the invention, against corrosion will be apparent if the following tests are carried oui:
A lead-tin coated steel pipe 1 would not withstand the salt-spray test according to the ASTM-B117, i.e. after about 360 hours such a pipe would e~hibit base-metal corrosion (red rust). The test according to DIM 50018/2.0 S (intensified industrial atmosphere) would produce poor results with a lead-tin coated pipe. Accordiny to this test, (corresponding to 2 litres of SO2), only one cycle is completed before base-metal corrosion becomes visible.
A galvanized steel pipe, carrying a layer of chromate and a layer of synthetic material, completes more than 50 cycles according to DIN 50018/2.0 S or more than 5000 hours according to ASTM-s 117 before base-metal corrosion appears.
According to the invention, steel pipes carrying a coating of lead--tin, an intermediate layer and a layer of syn-thetic material also complete more than 50 cycles according to DIN 50018/2.0 S
or 5000 hours according to ASTM-B 117.
According to the invention, steel pipes carrying a coating of zinc, an intermediate layer and a layer of synthetic material complete more than 60 cycles according to DIN 50018/2.0 S or 7,500 hours according to ASTM-B 117.
Accordiny to E'ig. 3 or 4, it is also possible to apply a layer of chromate between metal or metal-alloy layer 3 and intermediate layer 5 which has a positive effect upon resistance to corrosion in that it prevents sub-migration, such as may arise in the event oE damage (flying stones).
It will be unclerstood -that the invention is not limited to the exact constructions shown and described, but that various chanyes ancl modiications may be made without departing from the spirit and scope of the invention as deined in -the appended claims.
, , . .
Metal-alloy layer 3 is about 4 to 10 ~m :ln th:lc]cness, thus providing a hlgh-speecl process. Intermedlate layer 5, i.e. the so-called primer, in the ~orm Oe a synthetic resin, is such that it adheres firmly to underlying metal-alloy layer 3.
In one particular exemplary embodlment, both intermecliate layer 5 and layer 6 Oe synthetic materlal are hi.ghly resilient, hi~hly aclhesive ancl heat resistant.
Accord:Lng to Fig. 2, an additional layer 6 of highly resistant synthetic material or highly resistant thermosetting material is provided. The application of an additional layer 6 does not require an additional intermediate layer.
~Z~3~35~'7 The advan-tages of the pipe pro-tected, according to the invention, against corrosion will be apparent if the following tests are carried oui:
A lead-tin coated steel pipe 1 would not withstand the salt-spray test according to the ASTM-B117, i.e. after about 360 hours such a pipe would e~hibit base-metal corrosion (red rust). The test according to DIM 50018/2.0 S (intensified industrial atmosphere) would produce poor results with a lead-tin coated pipe. Accordiny to this test, (corresponding to 2 litres of SO2), only one cycle is completed before base-metal corrosion becomes visible.
A galvanized steel pipe, carrying a layer of chromate and a layer of synthetic material, completes more than 50 cycles according to DIN 50018/2.0 S or more than 5000 hours according to ASTM-s 117 before base-metal corrosion appears.
According to the invention, steel pipes carrying a coating of lead--tin, an intermediate layer and a layer of syn-thetic material also complete more than 50 cycles according to DIN 50018/2.0 S
or 5000 hours according to ASTM-B 117.
According to the invention, steel pipes carrying a coating of zinc, an intermediate layer and a layer of synthetic material complete more than 60 cycles according to DIN 50018/2.0 S or 7,500 hours according to ASTM-B 117.
Accordiny to E'ig. 3 or 4, it is also possible to apply a layer of chromate between metal or metal-alloy layer 3 and intermediate layer 5 which has a positive effect upon resistance to corrosion in that it prevents sub-migration, such as may arise in the event oE damage (flying stones).
It will be unclerstood -that the invention is not limited to the exact constructions shown and described, but that various chanyes ancl modiications may be made without departing from the spirit and scope of the invention as deined in -the appended claims.
, , . .
Claims (18)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A metallic pipe having corrosion protection applied to a surface of the object, said protection comprising a first layer of a metal or of a metal-alloy of low-melting-point metals overlying the surface and in contact therewith, an intermediate layer, both sides of which are adapted to adhere, overlying the first layer and in contact therewith; and at least one layer of a highly resistant, thermoplastic or thermosetting synthetic material is formed on said intermediate layer.
2. A metallic pipe having corrosion protection applied to a surface of the pipe, said protection comprising a first metal layer overlying the surface and in contact therewith; an intermediate layer, both sides of which are adapted to adhere, overlying the first metal layer and in contact therewith; and at least one layer of a highly resistant, thermoplastic or thermosetting synthetic material is formed on said intermediate layer.
3. A metallic pipe having corrosion protection applied to a surface of the pipe, said protection comprising a first layer of a metal or of a metal alloy of low-melting-point metals, overlying the surface and in contact therewith; a chromate layer overlying the first layer and in contact therewith; an intermediate layer, both sides of which are adapted to adhere, overlying said chromate layer and in contact therewith; and at least one layer of a highly resistant, thermoplastic or thermosetting synthetic material formed on said intermediate layer.
4. A metallic pipe having corrosion protection applied to a surface of the pipe, said protection comprising a first layer of a metal alloy of low-melting-point metals overlying the surface, an intermediate short-term, heat-insulating and barrier layer overlying the first layer; and a layer of higher-melting-point, highly resistant, thermoplastic or thermosetting synthetic material overlying the intermediate layer.
5. A metal pipe according to claims 1, 3 or 4 wherein the first layer consists of a lead-tin alloy.
6. A metal object according to claim 1, 3 or 4, wherein the first layer consists of a lead-tin alloy composed of 60 parts of lead and 40 parts of tin.
7. A metallic object according to claims 1, 2, or 3, wherein the first layer is between 4 and 10 µm thick.
8. A metallic pipe according to claim 2, wherein the first layer consists of zinc.
9. A metallic pipe according to claims 2, or 8, wherein the first layer consists of a galvanically deposited layer of zinc.
10. A metallic pipe according to claims 1, 2, or 3, wherein the intermediate layer adheres firmly to the first layer, or to the chromate layer located thereunder.
11. A metallic pipe according to claims 1, 2, or 3, characterized in that the temperature at which the film of intermediate layer is formed is lower than the melting point of the first layer positioned thereunder.
12. A metallic pipe according to claims 1, 2, or 3, characterized in that the intermediate layer has high resilient and adhesive properties.
13. A metallic pipe according to claims 1, 2, or 3, wherein additional layers of a highly resistant synthetic material are arranged upon the intermediate layer.
14. A method for coating a surface of a metallic pipe so as to impart corrosion resistance thereto, said method comprising:
mechanically or galvanically applying to the surface in a continuous operation a first layer of metal or of a metal alloy of low-melting point metals in the molten phase;
applying an intermediate layer of a primer in a solvent phase or in a dispersion phase over the first layer by flow coating or by spraying; and, applying a layer of highly resistant thermoplastic or thermosetting synthetic material in a solvent phase or a dispersion phase over the intermediate layer by flow coating or by spraying.
mechanically or galvanically applying to the surface in a continuous operation a first layer of metal or of a metal alloy of low-melting point metals in the molten phase;
applying an intermediate layer of a primer in a solvent phase or in a dispersion phase over the first layer by flow coating or by spraying; and, applying a layer of highly resistant thermoplastic or thermosetting synthetic material in a solvent phase or a dispersion phase over the intermediate layer by flow coating or by spraying.
15. A method for coating a surface of a metallic pipe so as to impart corrosion resistance thereto, said method comprising:
mechanically or galvanically applying to the surface in a continuous operation a first layer of metal or of a metal alloy of low-melting point metals in the molten phase;
electrostatically applying an intermediate layer of a primer in the solvent phase over the first layer; and, applying a layer of highly resistant thermoplastic or thermosetting synthetic material in a solvent phase or a dispersion phase over the intermediate layer by flow coating or by spraying.
mechanically or galvanically applying to the surface in a continuous operation a first layer of metal or of a metal alloy of low-melting point metals in the molten phase;
electrostatically applying an intermediate layer of a primer in the solvent phase over the first layer; and, applying a layer of highly resistant thermoplastic or thermosetting synthetic material in a solvent phase or a dispersion phase over the intermediate layer by flow coating or by spraying.
16. A method for coating a surface of a metallic pipe so as to impart corrosion resistance thereto, said method comprising:
mechanically or galvanically applying to the surface in a continuous operation a first layer of metal or of a metal alloy of low-melting point metals in the molten phase;
applying an intermediate layer of a primer in a solvent phase or in a dispersion phase over the first layer by flow coating or by spraying; and electrostatically applying a layer of highly resistant thermoplastic or thermosetting synthetic material in the solid phase over the intermediate layer.
mechanically or galvanically applying to the surface in a continuous operation a first layer of metal or of a metal alloy of low-melting point metals in the molten phase;
applying an intermediate layer of a primer in a solvent phase or in a dispersion phase over the first layer by flow coating or by spraying; and electrostatically applying a layer of highly resistant thermoplastic or thermosetting synthetic material in the solid phase over the intermediate layer.
17. A method according to claims 14, 15 or 16, wherein the first layer is applied at a temperature of between 190-235°C.
18. A method according to claims 14, 15 or 16, wherein the highly resistant synthetic material is stoved at a temperature of approximately 240-270°C, wherein it is fused onto the intermediate layer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19843438013 DE3438013A1 (en) | 1984-10-17 | 1984-10-17 | METAL TUBE PROVIDED WITH CORROSION PROTECTION AND METHOD FOR THE PRODUCTION THEREOF |
| DEP3438013.2 | 1984-10-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1238587A true CA1238587A (en) | 1988-06-28 |
Family
ID=6248093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000490702A Expired CA1238587A (en) | 1984-10-17 | 1985-09-13 | Metallic pipe provided with protection against corrosion and a method for the production thereof |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0178404B1 (en) |
| JP (1) | JPS6196279A (en) |
| BR (1) | BR8505113A (en) |
| CA (1) | CA1238587A (en) |
| DE (2) | DE3438013A1 (en) |
| ZA (1) | ZA857927B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104736915A (en) * | 2012-08-06 | 2015-06-24 | 圣戈班穆松桥 | Pipe member made from iron for a buried pipeline, comprising an outer coating |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2719698B2 (en) * | 1987-04-06 | 1998-02-25 | 臼井国際産業 株式会社 | Corrosion resistant multi-layer coated metal tube |
| GB2223188B (en) * | 1988-08-26 | 1992-04-15 | Usui Kokusai Sangyo Kk | Coated metal pipe and method for manufacturing the same |
| GB2222785B (en) * | 1988-09-17 | 1992-02-12 | Usui Kokusai Sangyo Kk | Multi-layered pipe coating |
| JP2709483B2 (en) * | 1988-09-17 | 1998-02-04 | 臼井国際産業株式会社 | Coating method for coated metal tubing |
| DE3906450C2 (en) * | 1989-03-01 | 1995-04-13 | Kraft Paul | Support plate for brake pads |
| DE3932865A1 (en) * | 1989-10-02 | 1991-04-11 | Akin Okan | METAL TUBE PROTECTED FROM CORROSION |
| US5301719A (en) * | 1991-12-12 | 1994-04-12 | E. I. Du Pont De Nemours And Company | Fluoroelastomer lined flue ducts |
| FR2708330B1 (en) * | 1993-07-28 | 1995-09-22 | Pont A Mousson | Piping element for piping, corresponding piping, and method of protecting by coating a piping element. |
| DE9400522U1 (en) * | 1994-01-13 | 1994-03-24 | Fulton-Rohr GmbH & Co. KG, 68766 Hockenheim | Pipeline for systems in motor vehicles |
| JP3515183B2 (en) * | 1994-08-30 | 2004-04-05 | 臼井国際産業株式会社 | Corrosion resistant resin coating structure on metal tube |
| JP3445858B2 (en) * | 1994-12-29 | 2003-09-08 | 臼井国際産業株式会社 | Automotive metal piping with a protective coating layer |
| DE10242772B4 (en) * | 2002-09-14 | 2005-06-09 | ITT Manufacturing Enterprises, Inc., Wilmington | Electroplating |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU36769A1 (en) | 1957-06-20 | |||
| DE2046449C3 (en) | 1970-09-21 | 1975-09-18 | Mecano-Bundy Gmbh, 6900 Heidelberg | Method and device for applying protective coatings to metal objects and application of the method |
| DE2651838C3 (en) * | 1976-11-13 | 1981-04-30 | Karl Heinz 3353 Bad Gandersheim Vahlbrauk | Process for the production of pipeline systems |
| CA1129804A (en) * | 1977-11-11 | 1982-08-17 | Masayoshi Usui | Anticorrosive overlap-coated iron or steel material |
| DE2839085A1 (en) * | 1978-09-08 | 1980-03-20 | Battelle Institut E V | Corrosion protection sheath for underground heat transport steel pipe - comprises zinc-coated impermeable polymer film resistant to heat and hydrolysis |
| US4213486A (en) * | 1978-11-06 | 1980-07-22 | The Kendall Company | Coated pipe and process for making same |
| DE3230955C2 (en) * | 1982-08-20 | 1984-10-04 | Hoesch Werke Ag, 4600 Dortmund | Process for sheathing a steel pipe with a sheathing layer made of polyethylene |
-
1984
- 1984-10-17 DE DE19843438013 patent/DE3438013A1/en active Granted
-
1985
- 1985-08-01 EP EP85109678A patent/EP0178404B1/en not_active Expired
- 1985-08-01 DE DE8585109678T patent/DE3574277D1/en not_active Expired
- 1985-09-13 CA CA000490702A patent/CA1238587A/en not_active Expired
- 1985-10-15 BR BR8505113A patent/BR8505113A/en not_active IP Right Cessation
- 1985-10-16 ZA ZA857927A patent/ZA857927B/en unknown
- 1985-10-16 JP JP60229009A patent/JPS6196279A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104736915A (en) * | 2012-08-06 | 2015-06-24 | 圣戈班穆松桥 | Pipe member made from iron for a buried pipeline, comprising an outer coating |
| US10876674B2 (en) | 2012-08-06 | 2020-12-29 | Saint-Gobain Pam | Iron-based piping element for buried pipeline, comprising an outer coating |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0178404A1 (en) | 1986-04-23 |
| DE3574277D1 (en) | 1989-12-21 |
| DE3438013C2 (en) | 1988-01-14 |
| JPS6196279A (en) | 1986-05-14 |
| DE3438013A1 (en) | 1986-04-30 |
| ZA857927B (en) | 1986-05-28 |
| EP0178404B1 (en) | 1989-11-15 |
| BR8505113A (en) | 1986-07-29 |
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