GB2191698A - Protective coating - Google Patents
Protective coating Download PDFInfo
- Publication number
- GB2191698A GB2191698A GB08614242A GB8614242A GB2191698A GB 2191698 A GB2191698 A GB 2191698A GB 08614242 A GB08614242 A GB 08614242A GB 8614242 A GB8614242 A GB 8614242A GB 2191698 A GB2191698 A GB 2191698A
- Authority
- GB
- United Kingdom
- Prior art keywords
- parts
- coating material
- material according
- diethanolamine
- water
- 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.)
- Withdrawn
Links
- 239000011253 protective coating Substances 0.000 title claims abstract description 9
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims abstract description 14
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims abstract description 9
- 235000010234 sodium benzoate Nutrition 0.000 claims abstract description 9
- 239000004299 sodium benzoate Substances 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 claims abstract description 8
- 239000003518 caustics Substances 0.000 claims abstract description 7
- 235000010288 sodium nitrite Nutrition 0.000 claims abstract description 7
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 230000003115 biocidal effect Effects 0.000 claims abstract description 5
- 239000003139 biocide Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims 2
- 238000010923 batch production Methods 0.000 claims 1
- 150000002148 esters Chemical class 0.000 claims 1
- 229910019142 PO4 Inorganic materials 0.000 abstract description 5
- 230000001050 lubricating effect Effects 0.000 abstract description 5
- 239000010452 phosphate Substances 0.000 abstract description 5
- 239000003973 paint Substances 0.000 abstract description 4
- -1 phosphate ester Chemical class 0.000 abstract description 4
- 239000004033 plastic Substances 0.000 abstract description 3
- 229920003023 plastic Polymers 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000007605 air drying Methods 0.000 abstract description 2
- 239000002344 surface layer Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 239000000375 suspending agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
This invention relates to an air-drying protective coating for metal sheet or plate and which is dry to touch and compatible with the direct application thereto of a paint or plastics surface layer, with minimal, if any, preparation, and which may have lubricating properties. In particular, the coating comprises a base product of, by weight, 15% to 35% Sodium Nitrite, up to 10% Sodium Benzoate, up to 30% Triethanolamine, 5 to 35% Diethanolamine with the balance water, 40 to 65 parts, by volume, of the base product having added to it, by volume, 30 to 35 parts of Liquid Caustic, up to 15 parts synthetic phosphate ester and between 0.5 and 1.5 parts of a biocide.
Description
SPECIFICATION
Protective coatings
This invention relates two protective coatings and more particularly relates to an air drying coating for protecting metal from rusting.
One common protective coating for e.g. mild steel sheetor plate is oil, since apartfrom its oxidation inhibiting effect its lubricating properties assist mechanical working steps performed on the metal, but one significant drawbackwith this medium is that if the metal isto be painted then it is necessary pre-requisite to this step to clean offthe oil coating, e.g. in a degreasing plant.
This is expensive and time-consuming, and it is an object of this invention to provide a protective coating which is drytotouch and is compatible with the direct application thereto of a paint or plastics surface layer, with minimal, if any, preparation, and which may have lubricating properties.
From one aspect, the present invention provides a protective coating material comprising a base product of, byweight, 15% to 35% Sodium Nitrite, upto 10%
Sodium Benzoate, upto 30% Triethanolamine, 5to 35% Diethanolamine with the balance water, 40 to 65 parts, byvolume,ofthe base product having added to it, by volume, 30 to 35 parts of Liquid Caustic, up to 15 parts synthetic phosphate ester and between 0.5 and 1.5 parts of biocide.
Preferably, at least 4% Sodium Benzoate is added.
Preferably, the Diethanolamine in the addition is an 88% strength solution (12% water).TheTriethanolamine is an 85% strength solution (15% water) and the
Caustic employed is 70 twaddle.
Thesynthetic phosphate easter may be applied if lubricating properties are required and the addition of this component will also increase alkalinity.
The addition to the base product may itself be diluted with water, typically by about 900 parts, say between 890 and 925, depending on the weight of the coating desired.
The protective coating may be applied to steel sheet or plate buy a dipping process, the metal having previously been pickled in an acid bath and subsequently neutralised or passivated. The bath may be at a temperature a few degrees higherthan ambient in orderto facilitate drying.
The dipping may conveniently be effected in a 'batch' process with the sheets/plates cut to size but alternatively it may be effected on a continuous basis.
The coating liquid is substantially chemically inert to most conventional paint and plastic finishes.
In accordance with this invention then, steel strip or plate is provided with 'non-oil' protection, typically between 0.025 and 0.5 microns thick which eliminates the drawback of oil removal identified above and is compatible with presswork etc. by its lubricating properties. The protected steel may withstand many months shelf life without oxidising to any material degree and it will readily accept stoving or powder paints etc. applied by conventional spray, dip or brush techniques or electrostatically with minimal preparation.
In orderthatthe invention may be fully understood, three embodiments will now be described, byway of example.
Two metre wide mild steel strip of say 12 mm thickness is cut into sheets of say 4 metres in length and a number ofthese, say 2tonnes in weight, are mounted on a supportframeand submerged in an acid tankforabout 15 minutes two remove scale/dirt, etc; subsequently they are submerged in a neutralising or passivating solution, which is alkaline, for about 10 minutes to assist the pickling process. The sheets are then submerged in a coating tank, withdrawn and may be dried naturally in air.
In one example the lattertankcontained a coating solution comprising, by volume:
(By weight
(26% Sodium Nitrite ( 4% Sodium Benzoate
5% Base Product (32% Diethanolamine 85%Strength (15% water)
(38% Water
3.13% Liquid Caustic 70 TW 0.1% Semi-acetate (Biocide)
1.0% Synthetic Phosphate ester 90.77% Water
In two other examples, the base product composi tionwaschangedto define (a) 30% Sodium Nitrite
4% Sodium Benzoate
7% Diethanolamine (88%) 25% Triethanolamine (85%) 34% Water (b) 20% Sodium Nitrite
7% Sodium Benzoate
15% Diethanolamine(88%)
15% Triethanolamine (85%} 43% Water
The base product may be recognised as having a composition not too dissimilar to conventional cut ting and grinding fluids with the Sodium Nitrite/
Benzoate acting as a rust inhibitor and the Diethanolamine/Triethanolamine acting as a suspension agent therefore. The synthetic phosphate ester acts as an extreme pressure fluid iubricantto aid presswork and the Caustic addition is utilised as a PH adjustment which, to avoid staining, should not exceed about 13.5. Together,these components enhance theadhe- sion to the metal sheets and reduce friction in the dried state. The biocide simply regulates the fluid lifetime.
Although this invention has been described with reference to the particular embodiment illustrated, it is to be understood that various modifications may readily be made without departing from the scope of this invention. For example, the particular composi tion defined above, whilst being most suitable for the purpose described, may be varied within certain limits whilst still achieving the benefits of this invention to an acceptable degree, cf. paragraph 4 in page 1.
Claims (1)
1. A protective coating material comprising a base product of, by weight, 15% to 35% Sodium
Nitrite, up to 10% Sodium Benzoate, up to 30% Triethanolamine, 5to 35% Diethanolamine with the balancewater,40to 65 parts, by volume, of the base producthaving added to it, byvolume, 30 to 35 parts of Liquid Caustic, upto 15 partssynthefic phosphase ester and between 0.5 and 1.5 parts of a biocide.
2. A coating material according to claim 1, wherein at least 4% Sodium Benzoate is added.
3. A coating material according to claim 1 orclaim 2, wherein Diethanolamine in the addition is an 88% strength solution (12% water).
4. A coating material according to any one of claims 1 to 4, wherein the Liquid Caustic is 70 twaddle.
6. Acoating product is itselfdilutedwith water, by about 900 parts.
7. A coating material according to any one of claims 1 to 6, which has been applied to a steel sheet or plate, this metal substrate having previously been pickled in an acid bath and subsequently neutralised or passivated.
8. A coating material according to claim 7, the application thereof to the metal substrate being effected in a batch process in a bath at a temperature a few degrees higherthan ambient.
9. A coating material substantially as herein described.
10. Steel sheet or plate coated with a material according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08614242A GB2191698A (en) | 1986-06-11 | 1986-06-11 | Protective coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08614242A GB2191698A (en) | 1986-06-11 | 1986-06-11 | Protective coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8614242D0 GB8614242D0 (en) | 1986-07-16 |
| GB2191698A true GB2191698A (en) | 1987-12-23 |
Family
ID=10599313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08614242A Withdrawn GB2191698A (en) | 1986-06-11 | 1986-06-11 | Protective coating |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2191698A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2130977C1 (en) * | 1993-01-19 | 1999-05-27 | Дзе Боинг Компани | Method of forming cobalt oxide conversion coating and aqueous solution for preparing cobalt oxide conversion coating |
-
1986
- 1986-06-11 GB GB08614242A patent/GB2191698A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2130977C1 (en) * | 1993-01-19 | 1999-05-27 | Дзе Боинг Компани | Method of forming cobalt oxide conversion coating and aqueous solution for preparing cobalt oxide conversion coating |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8614242D0 (en) | 1986-07-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |