US2863791A - Production of oxalate coatings on iron and steel - Google Patents
Production of oxalate coatings on iron and steel Download PDFInfo
- Publication number
- US2863791A US2863791A US576238A US57623856A US2863791A US 2863791 A US2863791 A US 2863791A US 576238 A US576238 A US 576238A US 57623856 A US57623856 A US 57623856A US 2863791 A US2863791 A US 2863791A
- Authority
- US
- United States
- Prior art keywords
- steel
- iron
- oxalic acid
- sodium nitrite
- concentration
- 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 - Lifetime
Links
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 title claims description 55
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 19
- 229910052742 iron Inorganic materials 0.000 title claims description 10
- 238000000576 coating method Methods 0.000 title description 18
- 229910000831 Steel Inorganic materials 0.000 title description 14
- 239000010959 steel Substances 0.000 title description 14
- 238000004519 manufacturing process Methods 0.000 title description 3
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 30
- 235000010288 sodium nitrite Nutrition 0.000 claims description 15
- 235000006408 oxalic acid Nutrition 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 8
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 229940116315 oxalic acid Drugs 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 3
- 229910001448 ferrous ion Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 241001584898 Cerma Species 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229940062993 ferrous oxalate Drugs 0.000 description 1
- -1 iron metals Chemical class 0.000 description 1
- OWZIYWAUNZMLRT-UHFFFAOYSA-L iron(2+);oxalate Chemical compound [Fe+2].[O-]C(=O)C([O-])=O OWZIYWAUNZMLRT-UHFFFAOYSA-L 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 150000003839 salts Chemical class 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
- 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
- C23C22/06—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 aqueous acidic solutions with pH less than 6
- C23C22/46—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 aqueous acidic solutions with pH less than 6 containing oxalates
Definitions
- My invention relates to a process for forming oxalate coatings on metal surfaces, in particular iron and steel surfaces.
- Oxalate coatings are used for the protection of iron metals and constitute an excellent basis for paint.
- the sodium chlorate in the process of forming oxalate coatings is replaced by another oxidizing agent, particularly sodium nitrite.
- another oxidizing agent particularly sodium nitrite.
- concentration of the sodium nitrite in the oxalic-acid bath must be maintained within the limits of 0.2 to 4 grams per litre, the optimum concentration being 1 to 2 g./l.
- concentration for the oxalic acid in the bath ranges from 3 g. to 50 g./l.
- the nitrite, used in form of an aqueous solution may be fed batchwise; but the results obtained are better and above all more constant if the feeding is continuous by dripping the sodium nitrite solution into the bath. It has further been found that the starting of the bath is easier if a ferrous salt is added initially in such an amount that the bath contains from 0.1 to 1 g./l. of ferrous ions. It is not necessary to subsequently add further amounts of this salt since during operation of the bath small amounts of ferrous ions go continuously into solution.
- the bath according to the invention can be employed either by dipping or spraying.
- Example 1 Soft-steel sheets are treated by dipping or spraying at room temperature for 3-4 minutes with oxalic acid solution containing 15 g./l. sodium chlorate. A ferrous oxalate coating is obtained, which is continuous and compact but covered by an incoherent powder which renders the surface diflicult to paint. The result is not improved if the concentration of sodium chlorate is increased or decreased.
- Example 2 Soft-steel sheets are treated with a solution containing 15 g./l. oxalic acid and 0.1 g./l. sodium nitrite, under the same conditions of Example 1. An incoherent and discontinuous coating is formed.
- Example 3 Soft-steel sheets are treated under the same conditions 2,863,791 Patented Dec. 9, 1958
- Example 4 Soft-steel sheets are treated under the same conditions as in Example 1 with a solution contatining 15 g./l. oxalic acid and 1.5 g./l. sodium nitrite.
- the coating obtained is continuous, compact and free from incoherent powder.
- Example 5 Soft-steel sheets are treated under the same conditions as in Example 1 but with a solution containing 15 g./l. oxalic acid and 4 g./l. sodium nitrite. A continuous and compact coating showing slight formation of incoherent powder is obtained.
- Example 6 Soft-steel sheets are treated under the conditions of Example 1 but with a solution containing 15 g./l. oxalic acid and 6 g./l. sodium nitrite. A coating is obtained which is continuous and compact but covered with an incoherent powder as obtained in Example 1.
- the concentration of the oxalic acid in the bath ranges from 3 g. to 50 g./l. however it is preferably maintained at 15 g./l., as described in the examples.
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Chemically Coating (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT794294X | 1955-04-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2863791A true US2863791A (en) | 1958-12-09 |
Family
ID=11316744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US576238A Expired - Lifetime US2863791A (en) | 1955-04-08 | 1956-04-05 | Production of oxalate coatings on iron and steel |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2863791A (en)) |
| BE (1) | BE546812A (en)) |
| FR (1) | FR1145046A (en)) |
| GB (1) | GB794294A (en)) |
| LU (1) | LU34298A1 (en)) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3116177A (en) * | 1959-10-19 | 1963-12-31 | Montedison Spa | Process for degreasing and oxalating in a single spray stage |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2148331A (en) * | 1937-02-25 | 1939-02-21 | Alrose Chemical Company | Method and composition for coating iron and steel articles |
| US2273234A (en) * | 1933-03-27 | 1942-02-17 | Parker Rust Proof Co | Method of and solution for producing a coated iron article |
-
0
- BE BE546812D patent/BE546812A/xx unknown
- LU LU34298D patent/LU34298A1/xx unknown
-
1956
- 1956-04-03 GB GB10177/56A patent/GB794294A/en not_active Expired
- 1956-04-05 FR FR1145046D patent/FR1145046A/fr not_active Expired
- 1956-04-05 US US576238A patent/US2863791A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2273234A (en) * | 1933-03-27 | 1942-02-17 | Parker Rust Proof Co | Method of and solution for producing a coated iron article |
| US2148331A (en) * | 1937-02-25 | 1939-02-21 | Alrose Chemical Company | Method and composition for coating iron and steel articles |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3116177A (en) * | 1959-10-19 | 1963-12-31 | Montedison Spa | Process for degreasing and oxalating in a single spray stage |
Also Published As
| Publication number | Publication date |
|---|---|
| LU34298A1 (en)) | |
| FR1145046A (fr) | 1957-10-21 |
| BE546812A (en)) | |
| GB794294A (en) | 1958-04-30 |
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