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Effect of Sn on the Color and Tarnishing of Cu-Mn-Zn Alloys

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Journal of Materials Science & Technology 2003年第2期19卷 144-146页

作者： jianshengwu YupingZHANG JinxuZHANG KeyLaboratoryoftheMinistryofEducationforHighTemperatureMaterialsandTesting ShanghaiJiaoTongUniversityShanghai200030China TaiyuanHeavyMachineryInstitute Taiyuan030024China KeyLaboratoryoftheMinistryofEducationforHighTemperatureMaterialsandTesting ShanghaiJiaoTongUniversityShanghai200030China

The effect of Sn on the color and tarnishing of Cu-Mn-Zn alloys is investigated quantitatively. Using the CIE LAB color system, color parameters such as L*, a* and V are selected to describe the surface color of atloys while the color difference (AB*) is used to evaluate the color stability. The results show that with the increase of Sn, the color change of Cu-Mn-Zn alloys is greatly reduced and the corrosion resistance in the synthetic sweat is improved dramatically. However, up to 4.4 wt pct Sn does not change the color of Cu-Mn-Zn alloys much. XPS and AES are employed to analyze the tarnished surface. It is proved that a Sn enriched film is formed and Sn takes the form of Sn oxide. This thin and protective oxide film can prevent alloy from further tarnishing.

关键词： Sn Cu-Mn-Zn alloys Color Tarnishing

Analysis of Orange Peel Defect in St14 Steel Sheet by Electron Backscattered Diffraction (EBSD)

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Journal of Materials Science & Technology 2005年第1期21卷 17-20页

作者： ShengquanCAO JinxuZHANG jianshengwu JiaguangCHEN KeyLaboratoryoftheMinstryofEducationforHighTemperatureMaterialsandTesting ShanghaiJiaoTongUniversityShanghai200030China ResearchInstitute ShanghaiBaosteelGroupCorp.Shanghai201101China

In this paper, the orange peel defect in the surface range of the st14 steel sheet has been investigated using the electron backscattered diffraction (EBSD) technique. It has been found that the orange peel defect in the st14 steel sheet was resulted from the local coarse grains which were produced during hot-rolling due to the critical deformation in dual-phase zone. During deep drawing, the coarse grains with {100} microtexture can slip on the {112} slip system to form bulging and yields orange peel defects, while the coarse grains with {112} orientation do not form the defect as the Schmid factor of {112} slip system in it equals zero.

关键词： Electron backscattered diffraction (EBSD) Orange peel defect Stl4 steel Microtexture

Characterization of Rust Layer Formed on Low Alloy Steel Exposed in Marine Atmosphere

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Journal of Materials Science & Technology 2002年第5期18卷 455-458页

作者： QuanchengZHANG jianshengwu WenlongZHENG JianjunWANG JiaguangCHEN XiaofangYANG AibaiLi Lab. for High Temp. Mat. Shanghai Jiaotong Univ. Shanghai 200030 China Shanghai Inst. of Mat. Sci. Shanghai 200379 China Baosteel Group of Shanghai Shanghai 200961 China

The iron rust phases formed on low alloy steels containing different quantities of Cr element have been characterized using EPMA, Raman spectroscopy, TEM, optical microscopy etc. The ion selective properties of synthesized rust films with the same phase constituent as the atmospheric corrosion products were investigated using self-made apparatus. The results showed that corrosion loss of steels exposed in marine atmosphere decreased rapidly as the Cr content of the steel was increased. Cr-containing steels were covered by a uniform compacted rust layer composed of fine particles with an average diameter of several nanometers. Inner rust layer of Cr-containing steel (2 mass fraction) was composed of a-CrxFe1-xOOH, with Cr content of about 5 mass fraction. Such rust layer showed cation selective property, and could depress the penetration of Cl- to contact substrate steel directly.

关键词： Corrosion Marine atmosphere Low alloy steel Iron oxyhydroxide