US4874480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treatment of titanium and titanium alloys
Assignee: Nihon Parkerizing Co Ltd
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Filing: 1988-04-20
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Granted: 1989-10-17
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Expires: 2008-04-20
Abstract
Abstract A method of producing titanium and titanium alloys having improved lubricity and cold working characteristics includes immersing titanium or titanium alloy as the cathode in an electrolytic conversion coating bath containing acidified zinc phosphate and forming a zinc phosphate coating on the titanium or titanium alloy by maintaining electrolysis conditions in the bath. Further improvements are achieved by pretreatment of the titanium or titanium alloy with a surface adjustment agent prior to immersion in the electrolytic conversion coating bath. The products are further treated with conventional lubricants and exhibit improved working characteristics.
Inventors
- 👤 Sakae Sonoda
- 👤 Kouji Hetsugi
- 👤 Yoshihiko Sawasaki
- 👤 Kouji Kaburagi
- 👤 Yasunobu Matsushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:42
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/36
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
82 words
A process for improving the lubricity and cold working characteristics of an object made of titanium or a titanium alloy, said process comprising: (a) immersing said object made of titanium or titanium alloy as a cathode in an electrolytic conversion coating solution containing an effective concentration of acidic zinc phosphate present as zinc and phosphoric acid ions; (b) maintaining electrolysis conditions to form an adherent zinc phosphate film on said object; and (c) treating said adherent zinc phosphate film with a lubricant.
Claim 2
Dependent Claim
82 words
A process for improving the lubricity and cold working characteristics of an object made of titanium or a titanium alloy, said process comprising: (a) immersing said object made of titanium or titanium alloy as a cathode in an electrolytic conversion coating solution containing an effective concentration of acidic zinc phosphate present as zinc and phosphoric acid ions; (b) maintaining electrolysis conditions to form an adherent zinc phosphate film on said object; and (c) treating said adherent zinc phosphate film with a lubricant.
Claim 3
Dependent Claim
21 words
The process of claim 1 in which the concentration of zinc ion is between about 1 and 50 grams per liter.
Claim 4
Dependent Claim
21 words
The process of claim 1 in which the concentration of zinc ion is between about 5 and 20 grams per liter.
Claim 5
Dependent Claim
21 words
The process of claim 1 in which the concentration of phosphate ion is between about 3 and 140 grams per liter.
Claim 6
Dependent Claim
21 words
The process of claim 1 in which the concentration of phosphate ion is between about 10 and 60 grams per liter.
Claim 7
Dependent Claim
21 words
The process of claim 1 containing at least one additional ion selected from the group consisting of calcium, manganese, and iron.
Claim 8
Dependent Claim
16 words
The process of claim 1 in which the conversion coating solution additionally contains an oxidizing agent.
Claim 9
Dependent Claim
19 words
The process of claim 1 in which said conversion coating solution has a pH between about 1 and 5.
Claim 10
Dependent Claim
19 words
The process of claim 1 in which said conversion coating solution has a pH between about 1.5 and 3.5.
Claim 11
Dependent Claim
22 words
The process of claim 1 in which the temperature of said conversion coating solution is maintained between about 30° and 80° C.
Claim 12
Dependent Claim
15 words
The process of claim 1 in which said electrolysis is effected employing a zinc anode.
Claim 13
Dependent Claim
25 words
The process of claim 1 in which the current density of said electrolysis at said cathode is between about 0.2 and 30 A/dm 2 .
Claim 14
Dependent Claim
18 words
The process of claim 1 in which the electrolysis time is between about 10 seconds and 5 minutes.
Claim 15
Dependent Claim
24 words
The process of claim 1 in which the coverage of said adherent zinc phosphate film is between about 2 and 20 g/m 2 .
Claim 16
Dependent Claim
99 words
A process for improving the lubricity and cold working characteristics of an object made of titanium or a titanium alloy, said process comprising: (a) treating said object made of titanium or titanium alloy with a colloidal titanium-based surface adjustment agent; (b) immersing said object made of titanium or titanium alloy as a cathode in an electrolytic conversion coating solution containing an effective concentration of acidiz zinc phosphate present as zinc and phosphoric acid ions; (c) maintaining electrolysis conditions to form an adherent zinc phosphate film on said object; and (d) treating said adherent zinc phosphate film with a lubricant.
Claim 17
Dependent Claim
99 words
A process for improving the lubricity and cold working characteristics of an object made of titanium or a titanium alloy, said process comprising: (a) treating said object made of titanium or titanium alloy with a colloidal titanium-based surface adjustment agent; (b) immersing said object made of titanium or titanium alloy as a cathode in an electrolytic conversion coating solution containing an effective concentration of acidiz zinc phosphate present as zinc and phosphoric acid ions; (c) maintaining electrolysis conditions to form an adherent zinc phosphate film on said object; and (d) treating said adherent zinc phosphate film with a lubricant.
Claim 18
Dependent Claim
21 words
The process of claim 15 in which said surface adjustment agent contains between about 10 and 200 ppm of titanium ions.
Claim 19
Dependent Claim
22 words
The process of claim 15 in which said surface adjustment agent additionally contains at least one of phosphate ions and pyrophosphate ions.
Claim 20
Dependent Claim
38 words
The process of claim 15 in which said treating of said object made of titanium or titanium alloy is by immersion in said surface adjusting agent, removal from said agent and immersion in said electrolytic conversion coating solution.
Claim 21
Dependent Claim
116 words
A process for improving the lubricity and cold working characteristics of an object made of titanium or a titanium alloy, said process comprising: (a) immersing said object made of titanium or titanium alloy as a cathode in an aqueous electrolytic conversion coating solution containing between about 1 and about 50 grams per liter of zinc ions, between about 3 and about 140 grams per liter of phosphoric acid ions and having a pH between about 1 and about 5; (b) maintaining electrolysis conditions to form an adherent zinc phosphate film on said object made of titanium or titanium alloy; and (c) separating said object from soluton and further treating said zinc phosphate film with a lubricant.
Claim 22
Dependent Claim
116 words
A process for improving the lubricity and cold working characteristics of an object made of titanium or a titanium alloy, said process comprising: (a) immersing said object made of titanium or titanium alloy as a cathode in an aqueous electrolytic conversion coating solution containing between about 1 and about 50 grams per liter of zinc ions, between about 3 and about 140 grams per liter of phosphoric acid ions and having a pH between about 1 and about 5; (b) maintaining electrolysis conditions to form an adherent zinc phosphate film on said object made of titanium or titanium alloy; and (c) separating said object from soluton and further treating said zinc phosphate film with a lubricant.
References Cited (Backward Citations)
US4639295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |