Composition and method for removing iron containing deposits fro

Details Composition and method for removing iron containing deposits fro Composition and method for removing iron containing deposits fro

1990-07-24

1991-05-14

Pal, Asok

Cleaning and liquid contact with solids

Processes

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

134 3, 134 28, 134 41, C23G 106

Patent

active

050152980

ABSTRACT:
A composition and method for removing iron containing deposits from a metal surface are provided. The metal surface is contacted with an aqueous cleaning composition comprising an acid selected from the group consisting of polycarboxylic acids and polyphosphonic acids, and at least one base selected from the group consisting of alkali metal hydroxides, alkali metal carbonates and alkali metal phosphates. The aqueous cleaning composition can be used to passivate the metal surface after iron containing deposits are removed therefrom. The composition and method are very suitable for removing iron containing deposits from metal surfaces of equipment constructed of dissimilar metals without adversely affecting the metals.

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Pp. 91, 103 and 265 from M. Fontana et al., Corrosion Engineering, 2nd Edition.

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