NOBLE METAL PROTECTIVE FILM AND METHOD OF FORMING THE SAME

摘要

Forming a strong and dense protective film with excellent adhesion to a noble metal base and includes a level of durability that would allow it to be frequently worn without paying particular attention to handling in daily life, and easily forming a protective film on the surface of a noble metal base which has excellent corrosion resistance, and where these effects are present over a long period of time. The noble metal protective film related to the present invention is a silica glass film having a film thickness of 0.2 μm to 1.0 μm formed by coating a composition for forming a glass film with polysilazane as the main component on a surface of a noble metal base, and holding the noble metal under a temperature less than the melting point of a noble metal base coated with the composition for forming a glass film in an atmosphere containing water vapor.

主权项

1. A noble metal protective film formed by coating a composition for forming a liquid glass film containing polysilazane as a main component on a surface of a noble metal base, consisting of a silica glass film formed on a surface of the noble metal base by hydrolysis of a coating film comprised from the composition for forming a glass film;
wherein the noble metal base is an Au—Al alloy containing gold and aluminum with gold in the range of 78 wt % to 80 wt % and aluminum in the range of 18 wt % to 21 wt %; and the silica glass film has a film thickness of 0.2 μm to 1.0 μm, and a Vickers hardness of 328.7 (HV) or more.