Cleaning Phosphor Bronze

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Cleaning Phosphor Bronze
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Cleaning Phosphor Bronze
Bronze is primarily a metal alloy of copper and
tin. The tin adds hardness to the copper and
increases durability. Phosphor bronze includes
the addition of up to 1 of phosphorous to the
alloy. This addition improves strength, reduces
the coefficient of friction of the metal and
results in a finer grain. The fluidity of the
molten metal is also increased making this alloy
easier to cast.
Bronze Water Spots
Bronze Oxidation/Tarnish
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Just like pure copper metal (note green Statue of
Liberty) and other bronze alloys, oxidation and
stains can appear of the surface of the metal.
This degrades the visual appearance required for
certain part requirements. The electrical parts
pictured below show tarnish, oxidation and water
stains on the parts on the left. The clean,
bright parts on the right were vibratory tumbled
with KP Ceramic Media and a solution of a mild
acid cleaner, Kramco 1030. The mechanical action
of the polishing media combined with the chemical
cleaning of the compound resulted in a smooth,
brilliant surface finish. This result was
obtained in only 30 minutes of tumbling.
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