GB1598989A - Process for the protection of metal surfaces - Google Patents
Process for the protection of metal surfaces Download PDFInfo
- Publication number
- GB1598989A GB1598989A GB2149078A GB2149078A GB1598989A GB 1598989 A GB1598989 A GB 1598989A GB 2149078 A GB2149078 A GB 2149078A GB 2149078 A GB2149078 A GB 2149078A GB 1598989 A GB1598989 A GB 1598989A
- Authority
- GB
- United Kingdom
- Prior art keywords
- weight
- composition
- muscovite
- zinc oxide
- phosphoric acid
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/12—Wash primers
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Description
(54) PROCESS FOR THE PROTECTION OF METAL SURFACES
(71) We, CENTRAL-INTERTRADE
FINANCE ESTABLISHMENT a Company organised according to the laws of LIECHTENSTEIN of VADUZ LIECHTENSTEIN, do hereby declare the invention, for which we pray that a patent may be granted to us and the method by which it is to be performed, to be particularly described in and by the following statement:
The present invention relates to a process for the costing of clean or oxidised metal surfaces, especially of clean or corroded surfaces consisting predominantly of iron, in which the surface to be protected is treated with an aqueous phospheric acid containing composition.
The process is suitable both for treating clean metal surfaces and also oxidised, corroded or rusty surfaces in a working process that does not require previous mechanical or chemical treatment to provide a protective layer. Thus it is especially possible to provide aluminium or zinc surfaces with a layer which for example allows the formation of a strongly adherent colour or protective coating. In the case of a surface consisting primarily of iron it makes possible the provision of a protective coating both on clean and corroded parts. The process is based on the discovery that a superior protection can only be obtained if the metal character of the metal surface to be protected is taken away.It is is not sufficient to effect an interruption in the water-oxygen-metal reaction by providing an organic layer but instead the metal surface must be rendered incapable of oxidation or of further oxidisation.
It is known that a protective layer, which is water insoluble and which is compatible with the metal surface is such away that it cannot be detached either mechanically or through the attack of corrosive agents, can be produced by treating the metal surface with certain agents, can be produced by treating the metal surface with certain agents. One previously known agent that produces this effect comprises, in addition to phosphoric acid, potash mica (Muscovite) and poly vinyl acetate in the approximate proportions:
15% by weight phosphoric acid
15% by weight potash mica and
12% by weight of a liquid plastic mixture based on poly vinyl acetate, with the residue being water.
This agent which is applied to the surface to be treated by a painting process makes possible not only the protection of clean iron surfaces but also the protection of corroded iron surfaces or oxidised other metal surfaces.
For the treatment of already corroded surfaces so called rust removers are known. They always contain phosphoric acid, which is usually mixed with surface active compounds such as kieselguhr, talcum etc. to form a brushable paste. These rust removers can under certain conditions form a primer coat for the actual protective layer but a durable primer coat can only be produced with exact knowledge of the corrosion layer and the ratio, for the time being, between its components and the ingredients of the rust remover so that a general use of these rust removers is not possible.
The invention lies in a process of the already outlined type in which a composition of the formulation:
8 to 35% by weight phosphoric acid,
5 to 16% by weight muscovite,
2 to 8% by weight zinc oxide,
1 to 7% by weight methylsiloxane, and optionally
1 to 7% by weight sulphamic acid, the residue being water with an anionic surface active agent, is used.
When the composition is applied to an already corroded surface a conversion of the oxide layer occurs whether the corrosion is oxide layer or rust, furnace scale, mill scale or similar surface phenomenon. At the same time the formation of the protective coating proceeds in a single operation with no need for an after treatment. There is formed a resinous strong coating which exhibits an extraordinarily good resistance to corrosive stress.
It is believed that in the inventive treatment of an iron surface the protective layer forms in the following manner although the following explanation of the invention should not be considered limiting. A protective layer which fulfills its function forms because the edge of the elementary cell of the cubic modification of leucophosphite, that is potassium iron (III) phosphate, arranges itself in the base diagonals of the iron lattice with orientation of the lattice points above iron atoms. With each 5 fold charged phosphorus ion an iron atom finds itself limited by the position of the phosphate tetrahedron to the centre edge of the elementary cell of the leucophosphite. Because of the induced drain of electrons the phosphorus, limited by its charge layer, forms positive charges on the iron atoms.The three times negatively charged phosphate tetrahedron therefore acts strongly to draw the induced charges in the iron lattice. The attachment of the protective layer to the metal surface depends on this effect and by this means long term corrosion protection is achieved.
The protective layer can be applied by spraying, brushing, rolling or atomisation or by dipping in a bath.
In the first case the composition can have for example the following composition:
25 to 35% by weight iron free phosphoric acid,
7 to 16% by weight muscovite,
2 to 8% by weight zinc oxide,
2 to 7% by weight methylsiloxane, the residue being soft water with an anionic surfactant
Preferably the composition has the following composition:
30% by weight iron free phosphoric acid,
12% by weight muscovite,
5% by weight zinc oxide,
4% by weight methysiloxane,
49% by weight soft water with anionic surfactant.
For working in a dipping bath the following composition is most advantageous:
8 to 16% by weight iron free phosphoric acid,
5 to 13% by weight muscovite,
3 to 8% by weight zinc oxide,
1 to 7% by weight methylsiloxane,
1 to 7% by weight sulphamic acid, the residue being soft water with an anionic surfactant.
Especially suitable is the following composition when a dipping bath is used:
15% by weight iron free phosphoric acid,
12% by weight muscovite,
5% by weight zinc oxide,
4% by weight methylsiloxane,
4% by weight sulphamic acid,
60% by weight soft water with an anionic surfactant.
The dipping bath technique is operable at room temperature but by heating for example to a temperature of 45 to 800C the process can be accelerated. The object of the invention is the above composition, and corresponding mixtures or dipping baths for carrying out the inventive process.
WHAT WE CLAIM IS:
1. A process for producing a coating on a clean or oxidised metal surface, wherein the surface is treated with a composition comprising:
8 to 35% by weight phosphoric acid,
5 to 16% by weight muscovite,
2 to 8% by weight zinc oxide and 1 to 7% by weight methylsiloxane and optionally
1 to 7% by weight sulphamic acid, the remainder being water including an anionic surfactant.
2. A process as claimed in claim 1 wherein a composition comprising:
25 to 30% by weight iron free phosphoric acid,
7 to 16% by weight muscovite,
2 to 8% by weight zinc oxide, and
2 to 7% by weight methylsiloxane, the remainder being water with an anionic surfactant, is applied by sprinkling, brushing, rolling or atomisation to the surface to be treated.
3. A process as claimed in claim 2 wherein the composition comprises:
30% by weight iron free phosphoric acid,
12% by weight muscovite,
5% by weight zinc oxide,
4% by weight methylsiloxane, and
49% by weight of soft water with an anionic surfactant.
4. A process as claimed in claim 1 wherein a composition comprising:
8 to 16% by weight of iron free phosphoric acid,
5 to 13% by weight muscovite,
3 to 8% by weight zinc oxide,
1 to 7% by weight methylsiloxane, and
1 to 7% by weight sulphamic acid, the remainder being soft water with an anionic surfactant, is applied by dipping the article to be treated into a bath.
5. A process as claimed in Claim 4 wherein the composition comprises substantially:
15% by weight of iron free phosphoric acid,
12% by weight muscovite,
5% by weight zinc oxide,
4% by weight methylsiloxane,
4% by weight sulphamic acid, and
60% by weight of soft water with an anionic surfactant.
6. A process as claimed in Claim 4 or Claim 5 wherein the dipping bath has a temperature of from 450C to 80 C.
7. An aqueous composition comprising:
8 to 35% by weight phosphoric acid,
5 to 16% by weight muscovite,
2 to 8% by weight zinc oxide,
1 to 7% by weight methylsiloxane, and optionally
1 to 7% by weight sulphamic acid, the remainder being water with an anionic surfactant.
8. A composition comprising:
25 to 35% by weight iron free phosphoric acid,
7 to 16% by weight muscovite,
2 to 8% by weight zinc oxide,
2 to 7% by weight methylsiloxane, the remainder being water with an anionic surfactant.
9. A composition comprising substantially:
30% by weight of iron free phosphoric acid,
12% by weight muscovite,
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (13)
1 to 7% by weight sulphamic acid, the remainder being water including an anionic surfactant.
2. A process as claimed in claim 1 wherein a composition comprising:
25 to 30% by weight iron free phosphoric acid,
7 to 16% by weight muscovite,
2 to 8% by weight zinc oxide, and
2 to 7% by weight methylsiloxane, the remainder being water with an anionic surfactant, is applied by sprinkling, brushing, rolling or atomisation to the surface to be treated.
3. A process as claimed in claim 2 wherein the composition comprises:
30% by weight iron free phosphoric acid,
12% by weight muscovite,
5% by weight zinc oxide,
4% by weight methylsiloxane, and
49% by weight of soft water with an anionic surfactant.
4. A process as claimed in claim 1 wherein a composition comprising:
8 to 16% by weight of iron free phosphoric acid,
5 to 13% by weight muscovite,
3 to 8% by weight zinc oxide,
1 to 7% by weight methylsiloxane, and
1 to 7% by weight sulphamic acid, the remainder being soft water with an anionic surfactant, is applied by dipping the article to be treated into a bath.
5. A process as claimed in Claim 4 wherein the composition comprises substantially:
15% by weight of iron free phosphoric acid,
12% by weight muscovite,
5% by weight zinc oxide,
4% by weight methylsiloxane,
4% by weight sulphamic acid, and
60% by weight of soft water with an anionic surfactant.
6. A process as claimed in Claim 4 or Claim 5 wherein the dipping bath has a temperature of from 450C to 80 C.
7. An aqueous composition comprising:
8 to 35% by weight phosphoric acid,
5 to 16% by weight muscovite,
2 to 8% by weight zinc oxide,
1 to 7% by weight methylsiloxane, and optionally
1 to 7% by weight sulphamic acid, the remainder being water with an anionic surfactant.
8. A composition comprising:
25 to 35% by weight iron free phosphoric acid,
7 to 16% by weight muscovite,
2 to 8% by weight zinc oxide,
2 to 7% by weight methylsiloxane, the remainder being water with an anionic surfactant.
9. A composition comprising substantially:
30% by weight of iron free phosphoric acid,
12% by weight muscovite,
5% by weight zinc oxide,
4% by weight methylsiloxane, and
49% by weight of soft water with an anionic surfactant.
10. A composition comprising:
8 to 16% by weight of iron free phosphoric acid,
5 to 13% by weight muscovite,
3to 8% by weight zinc oxide,
1 to 7% by weight methylsiloxane, and
1 to 7% by weight sulphamic acid, the remainder being soft water with an anionic surfactant.
11.. A composition comprising substantially:
15% by weight of iron free phosphoric acid,
12% by weight muscovite,
5% by weight zinc oxide,
4% by weight methylsiloxane,
4% by weight sulphamic acid, and
60% by weight soft water with an anionic surfactant.
12. A process as claimed in Claim 1 for the treatment of metal surfaces substantially as described herein.
13. A composition as claimed in Claim 7 for use in the treatment of metal surfaces substantially as described herein.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT365577 | 1977-05-23 | ||
| AT98678 | 1978-02-13 | ||
| AT261378 | 1978-04-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1598989A true GB1598989A (en) | 1981-09-30 |
Family
ID=27146960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2149078A Expired GB1598989A (en) | 1977-05-23 | 1978-05-23 | Process for the protection of metal surfaces |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE2821072A1 (en) |
| FR (1) | FR2392094A1 (en) |
| GB (1) | GB1598989A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1120363B (en) * | 1979-05-29 | 1986-03-19 | Fosfa Col S A S Di A Dal Pane | PROCEDURE FOR PREPARING A PRODUCT ACTIVATING THE PHOSPHATION PROCESSES AND PRODUCT OBTAINED WITH THE SAME PROCEDURE |
| IT1208665B (en) * | 1984-01-04 | 1989-07-10 | Sperimentale Metallurg Spa E T | HIGH RESISTANCE THERMAL RESISTANT COATING FOR METAL SHEETS |
| DE3307158A1 (en) * | 1983-03-01 | 1984-09-06 | Hilti Ag, Schaan | METHOD FOR ACTIVATING PHOSPHATE LAYER TRAINING ON METALS AND MEANS FOR CARRYING OUT SUCH METHODS |
| US5728203A (en) * | 1995-10-26 | 1998-03-17 | Lord Corporation | Aqueous protective and adhesion promoting composition |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2385800A (en) * | 1941-02-27 | 1945-10-02 | American Chem Paint Co | Paint |
| DE1669146B1 (en) * | 1967-03-21 | 1971-12-30 | Kussmann Ferro Chemie | Highly heat-resistant zinc dust paint |
-
1978
- 1978-05-13 DE DE19782821072 patent/DE2821072A1/en not_active Withdrawn
- 1978-05-23 GB GB2149078A patent/GB1598989A/en not_active Expired
- 1978-05-23 FR FR7815208A patent/FR2392094A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2392094B1 (en) | 1983-07-22 |
| DE2821072A1 (en) | 1978-12-14 |
| FR2392094A1 (en) | 1978-12-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |