What did Surface Sulfurization look like?

The object surface shows a black or dark-gray dense protective layer distinct from the original bronze color, with significantly improved corrosion resistance.

How did Surface Sulfurization work?

Sulfur/sulfide → applied to bronze surface → heated → Cu + 2S → Cu₂S/CuS → dense copper sulfide layer forms → isolates from air and water → prevents further oxidation.

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硫化处理

Surface Sulfurization

Treating bronze surfaces with sulfur or sulfur-containing substances to form a stable copper sulfide protective layer that prevents further corrosion.

硫化处理

Scientific Principle

Surface passivation: Cu₂S and CuS have high chemical stability and do not react further in air, forming a protective barrier.

硫化处理

Surface Sulfurization

Scientific Principle

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