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Soldered joint turned gold colored

2004

During UL high temperature long term testing of a new product, we noticed that the soldered joint (63% Tin, 37% Lead)turned gold in color.

Here are the specs:
Base metal: Terne (LT01) plated Steel 85% Lead, 15% Tin.
Solder: 63% Tin, 37% Lead.
Flux: Superior Flux # 65 Inorganic free of Zinc Chloride.
High Temperature exposure test: 300 °F heated Oven.
Duration of the test: 90 days.

Did we use the wrong flux for the type of the base metal? This is odd but we never had any problem with Brass material.

Thanks,

Moe Rammal
Heat Responsive soldered fusible links - Standish, Michigan

Passivated tin gives a yellowish color.

Khair Shishani
aircraft maintenance - Al Ain, UAE
2004

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