Galvanized steel sheet protected by chromium and chromium oxide layers
First Claim
1. Steel sheet, protected by a zinc coating overlaid with a protective layer of chromium and hydrated oxides of chromium, the chromium metal being in the form of particles having average dimensions of about 0.03 micron, while at least 40% by volume of the metallic chromium is in the form of particles measuring less than 0.02 micron.
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Accused Products
Abstract
Steel sheet, especially suitable for car-body fabrication, galvanized and further protected by a layer of metallic chromium and hydrated oxides of chromium, electrolytically deposited. The improvement is that the metallic chromium is present in extremely fine particles that exert a very marked covering and protective effect on the underlying zinc. In this way, and with the help of the chromium oxides that further cover and protect the underlying layers, a product is obtained whose corrosion resistance is far superior to that of similar products.
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Citations
6 Claims
- 1. Steel sheet, protected by a zinc coating overlaid with a protective layer of chromium and hydrated oxides of chromium, the chromium metal being in the form of particles having average dimensions of about 0.03 micron, while at least 40% by volume of the metallic chromium is in the form of particles measuring less than 0.02 micron.
Specification