Structure and Formative Mechanism of Black Patina on Bronze Mirrors

Zhaozeng Ma; Ling Du; Xiulan Yin; Lianji Jin; Chunying Fang

Volume 5 Issue 3

Sep. 1998

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Abstract

International Journal of Minerals, Metallurgy and Materials > 1998 > 5(3): 147-155.

Zhaozeng Ma, Ling Du, Xiulan Yin, Lianji Jin, and Chunying Fang, Structure and Formative Mechanism of Black Patina on Bronze Mirrors, J. Univ. Sci. Technol. Beijing , 5(1998), No. 3, pp.147-155.

Cite this article as:

Zhaozeng Ma, Ling Du, Xiulan Yin, Lianji Jin, and Chunying Fang, Structure and Formative Mechanism of Black Patina on Bronze Mirrors, J. Univ. Sci. Technol. Beijing , 5(1998), No. 3, pp.147-155.

Cite this article as:

Zhaozeng Ma, Ling Du, Xiulan Yin, Lianji Jin, and Chunying Fang, Structure and Formative Mechanism of Black Patina on Bronze Mirrors, J. Univ. Sci. Technol. Beijing , 5(1998), No. 3, pp.147-155.

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Structure and Formative Mechanism of Black Patina on Bronze Mirrors

Author Affilications

Applied Science School, University of Science and Technology Beijing, Beijing 100083, China

Received: 09 May 1998; Available Online: 16 June 2021

Graphical Abstract

Abstract

Abstract

The formation of the black patina induced by soil humic asid under different conditions was studied, the black, grey and brown colored shiny surfaces prepared in laboratory were analyzed. As a result the formation of tin-rich shiny black surface on bronze mirrors is the product of soil corrosion of the bronze mirrors. The patina is formed by reection between the alloy and the humic acid in soil, and leaching of copper and lead oxides through a long period time when the mirrors were buried under the ground leaving a dense compact corrosion-resistant layer consisted predominantly of stannic oxide microcrystal.
- black patina on ancient bronze mirror,
- humic acid,
- soil corrosion,
- SnO₂ microcrystal

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