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Using a Sacrificial Anode to Prevent the Corrosion of the Gold Plated Battery Contacts

IP.com Disclosure Number: IPCOM000195554D
Published in the IP.com Journal: Volume 10 Issue 5B (2010-05-24)
Included in the Prior Art Database: 2010-May-24
Document File: 2 page(s) / 139K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

For the electrical connection between the battery and the hearing aid, there are currently used gold plated contacts. During the lifetime of the hearing aid these battery contacts corrode, so that the electrical connection gets disturbed. In that case the gold plated battery contacts had to replace. It is proposed to install a sacrificial anode into hearing aids to prevent the corrosion of the gold plated battery contacts. The sacrificial anode consists of a metal that is more easily oxidized than the gold plated contacts. Hence, the sacrificial anode metal gets corrode before the gold plated contacts get corroded. Suitable anode materials are for example zinc or magnesium.

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Using a Sacrificial Anode to Prevent the Corrosion of the Gold Plated Battery Contacts

Idea: Kristy Lim, SG-Singapore; Harald Klemenz, SG-Singapore

For the electrical connection between the battery and the hearing aid, there are currently used gold plated contacts. During the lifetime of the hearing aid these battery contacts corrode, so that the electrical connection gets disturbed. In that case the gold plated battery contacts had to replace.

It is proposed to install a sacrificial anode into hearing aids to prevent the corrosion of the gold plated battery contacts. The sacrificial anode consists of a metal that is more easily oxidized than the gold plated contacts. Hence, the sacrificial anode metal gets corrode before the gold plated contacts get corroded. Suitable anode materials are for example zinc or magnesium. These metals are more active than gold and also not harmful or poisonous to health. The sacrificial anode of zinc or magnesium has to be connected to the battery contacts, as it is shown in Figure 1. Thereby, the sacrificial anode can also be embedded inside the faceplate (see Figure 2).

The advantage of the proposed solution is that the sacrificial anode corrodes first and prevents the corrosion of the battery contacts. The material of the anode is much cheaper and easier to replace then the gold plated battery contacts. The usage of magnesium and zinc, as it is proposed, is not harmful to human health and can be used in hearing instruments.

Figur...