US4336111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for determining the strength of a metal processing solution
Assignee: Boeing Co
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Filing: 1979-10-25
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Granted: 1982-06-22
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Expires: 1999-10-25
Abstract
Abstract Disclosed is a method for determining the strength of a metal processing solution, defined herein to include electroless metal plating solutions and chemical etching solutions wherein a metal is plated onto and stripped from, respectively, the surface of a metal substrate. A pair of electrodes, preferably composed of the metal being plated in the case of an electroless metal plating solution or the metal having been etched in the case of a chemical etching solution, are immersed spaced from one another in the metal processing solution. A voltage is gradually applied across the electrodes and steadily increased. As the voltage is increased, the current flowing between the electrodes in the solution is monitored. The point at which the current first passes through a maximum value and begins to decrease is recorded as a function of time or voltage and is correlated empirically with the strength of the metal processing solution.
Inventors
- 👤 Donald R. Graunke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:19
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/42
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
128 words
A method of measuring the etching rate of a chemical etching solution with respect to a predetermined metal susceptible to etching by said solution, comprising the steps of: (a) immersing a pair of spaced electrodes in a chemical etching solution capable of oxidizing said predetermined metal in its native form to an oxidized ionic species in solution, at least one of said electrodes being composed of said predetermined metal susceptible to etching by said etching solution; (b) applying an increasing electrical potential across said spaced electrodes to thereby produce an electric current through said solution between said electrodes; and (c) monitoring said current to determine the magnitude of the peak current at the point at which said current first begins to decrease as said increasing potential is applied.
Claim 2
Independent Claim
128 words
A method of measuring the etching rate of a chemical etching solution with respect to a predetermined metal susceptible to etching by said solution, comprising the steps of: (a) immersing a pair of spaced electrodes in a chemical etching solution capable of oxidizing said predetermined metal in its native form to an oxidized ionic species in solution, at least one of said electrodes being composed of said predetermined metal susceptible to etching by said etching solution; (b) applying an increasing electrical potential across said spaced electrodes to thereby produce an electric current through said solution between said electrodes; and (c) monitoring said current to determine the magnitude of the peak current at the point at which said current first begins to decrease as said increasing potential is applied.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein both of said electrodes are composed of said predetermined metal susceptible to etching by said solution.
Claim 4
Dependent Claim
19 words
The method of claim 2 wherein said electric potential is increased from zero at a linear rate of increase.
Claim 5
Dependent Claim
36 words
The method of claim 1 wherein the polarity of said one electrode composed of said predetermined metal susceptible to etching by said etching solution is positive when said electrical potential is being applied across said electrodes.
Claim 6
Dependent Claim
46 words
The method of claim 1, 4, or 3 further comprising the step of correlating the magnitude of said peak current with the magnitudes of peak currents obtained for standard solutions of known absolute etching rates to thereby determine the absolute etching rate of said etching solution.
Claim 7
Dependent Claim
16 words
The method defined in claim 1 wherein said chemical etching solution is an aluminum deoxidizing solution.
Claim 8
Independent Claim
101 words
A method of determining the plating rate of a catalytic electroless metal plating solution comprising the steps of: (a) immersing a pair of spaced electrodes in a catalytic electroless plating solution, at least one of said electrodes being composed of a metal susceptible to plating by said electroless plating solution; (b) applying an increasing electric potential across said spaced electrodes to thereby produce a current through said solution between said electrodes; and (c) monitoring said current to determine the magnitude of the peak current at the point at which said current first begins to decrease as said increasing potential is applied.
Claim 9
Independent Claim
101 words
A method of determining the plating rate of a catalytic electroless metal plating solution comprising the steps of: (a) immersing a pair of spaced electrodes in a catalytic electroless plating solution, at least one of said electrodes being composed of a metal susceptible to plating by said electroless plating solution; (b) applying an increasing electric potential across said spaced electrodes to thereby produce a current through said solution between said electrodes; and (c) monitoring said current to determine the magnitude of the peak current at the point at which said current first begins to decrease as said increasing potential is applied.
Claim 10
Dependent Claim
24 words
The method of claim 7 wherein both of said electrodes are composed of a metal susceptible to plating by said electroless metal plating solution.
Claim 11
Dependent Claim
19 words
The method of claim 8 wherein said electric potential is increased from zero at a linear rate of increase.
Claim 12
Dependent Claim
37 words
The method of claim 7 wherein the polarity of said one electrode composed of a metal susceptible to plating by said electroless metal plating solution is positive when said electrical potential is being applied across said electrodes.
Claim 13
Independent Claim
48 words
The method of claims 7, 10 or 9 further comprising the step of correlating the magnitude of said peak current with the magnitudes of peak currents obtained for standard solutions of known absolute plating rates to thereby determine the absolute plating rate of said electroless metal plating solution.
Claim 14
Dependent Claim
16 words
The method of defined in claim 7 wherein said solution is an electroless nickel plating solution.
Claim 15
Dependent Claim
15 words
The method defined in claim 7 wherein said solution is an electroless copper plating solution.
References Cited (Backward Citations)
US3207678A
Cited
GB1009111A
Cited
US3405041A
Cited
US3428532A
Cited
US3925168A
Cited
US3922205A
Cited
US4146437A
Cited
US4146437B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |