Metal brightening composition and process that do not damage gla

Details Metal brightening composition and process that do not damage gla Metal brightening composition and process that do not damage gla

1996-05-24

1998-09-22

Breneman, R. Bruce

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 3, 216103, 216104, C03C 2300, C23G 102

Patent

active

058109382

ABSTRACT:
An aqueous liquid composition containing acid fluoride ions (i.e., HF.sub.2.sup.-) not derived from hydrogen fluoride, together with an acid stronger than acid fluoride ions, and, preferably, surfactant, is very effective in brightening unpainted metal surfaces such as those of stainless steel and aluminum without reducing the transparency of any glass objects such as windows with which the composition may come into contact. Otherwise similar compositions containing aqueous hydrofluoric acid usually etch glass in such a way as to reduce its transparency. The invention is particularly useful for brightening soiled or otherwise darkened surfaces of rail passenger cars.

REFERENCES:
patent: 5393447 (1995-02-01), Carlson et al.

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