Damage of Stainless Steels by Erosion in Molten Pb-free Solder

Author

Takemoto, Tadashi ; Takemoto, Masaharu

Author_Institution

Joining & Welding Res. Inst., Osaka Univ.

fYear

2005

Firstpage

908

Lastpage

912

Abstract

The damage of stainless steels in molten lead-free solder was investigated by the cross sectional observation of damaged area of stainless steel. The damage is caused by dissolution and reaction between molten solder and solid stainless steel. The inhomogeneous damage was observed in cross sectional observation, therefore, the maximum damage depth was defined as the maximum erosion. The increase of the immersion time enhanced the maximum erosion. The dissolution rate of Sn-Ag based lead-free solders were almost three times higher than in the conventional Sn-Pb eutectic. The addition of Cu, In and Bi to Sn-Ag gives only a little effect on the erosion. The use of Sn-Zn system lead-free solder enhanced the maximum erosion. SUS 309S with higher Cr and Ni was found to reduce erosion to some extent. The eco-design of flow soldering bath is considered

Keywords

design for environment; dissolving; erosion; solders; stainless steel; Sn-Pb eutectic; dissolution rate; ecodesign; erosion; flow soldering bath; molten lead-free solder; stainless steel damage; Bismuth; Chemicals; Chromium alloys; Contamination; Copper; Environmentally friendly manufacturing techniques; Iron; Lead; Soldering equipment; Steel; Sn-Ag; Sn-Zn; dissolution; erosion; flow soldering bath; lead-free solder; stainless steel;

fLanguage

English

Publisher

ieee

Conference_Titel

Environmentally Conscious Design and Inverse Manufacturing, 2005. Eco Design 2005. Fourth International Symposium on

Conference_Location

Tokyo

Print_ISBN

1-4244-0081-3

Type

conf

DOI

10.1109/ECODIM.2005.1619377

Filename

1619377