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US 7,248,462 B2Granted
Method of anodizing valve metal derived anode bodies and electrolyte therefore
AssigneeKemet Electronics Corporation
InventorsBrian John Melody, John Tony Kinard, David Alexander Wheeler
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Abstract
An electrolyte solution for anodizing a metal and a capacitor comprising the anodized metal. The electrolyte comprises more than about 5%, by weight, and less than about 30%, by weight, water; about 0.1 to 20%, by weight, ionogen and an aprotic polar solvent. The ionogen comprises phosphoric acid and an alkanol amine in an amount, and ratio, sufficient to maintain a pH of about 4 to about 9.
Claims19
An anode anodized by the electrolyte comprising:
- more than about 5%, by weight, and less than about 30%, by weight, water;
- about 0.1 to 20%, by weight, ionogen comprising:
- phosphoric acid;
- and
- an alkanol amine wherein the amount of ionogen is sufficient to maintain a pH of about 4 to about 9;
- and
- an aprotic polar solvent.
4 more elements
An anode anodized by the method of:
- providing a valve metal;
- placing said valve metal in an electrolyte comprising:
- more than about 5%, by weight, and less than about 30%, by weight, water;
- about 0.1 to 20%, by weight, ionogen comprising:
- phosphoric acid;
- and
- an alkanol amine wherein the amount of ionogen is sufficient to maintain a pH of about 4 to about 9;
- and
- an aprotic polar solvent;
- and
- subjecting said valve metal to an anodizing voltage.
8 more elements
A capacitor formed by the process of:
- providing a valve metal;
- placing said valve metal in an electrolyte comprising:
- more than about 5%, by weight, and less than about 30%, by weight, water;
- about 0.1 to 20%, by weight, ionogen comprising:
- phosphoric acid;
- and
- an alkanol amine wherein the amount of ionogen is sufficient to maintain a pH of about 4 to about 9;
- and
- an aprotic polar solvent;
- and
- subjecting said valve metal to an anodizing voltage to form an anodized anode;
- forming a capacitor with said anodized anode.
9 more elements
Dependencies are inferred from the claim text.