Abstract: The present invention provides a formulation for use in the treatment of corrosion and metal sulphide scale deposits in aqueous systems, said formulation comprising a tetrakis (hydroxyorgano) phosphonium salt (THP+ salt) and a primary, secondary or tertiary alcohol having an acetylenic bond in the carbon backbone. The invention also provides the use of such a formulation for treating corrosion of mild steel, copper or aluminium, and a method for treatment of an aqueous system containing or in contact with a metal sulphide scale while concomitantly inhibiting the corrosion of surfaces in contact with said aqueous system, which method comprises the addition to said aqueous system of a scale and corrosion inhibiting amount of such a formulation.

Abstract: The present invention provides a formulation for use in the treatment of corrosion and metal sulphide scale deposits in aqueous systems, said formulation comprising a tetrakis (hydroxyorgano) phosphonium salt (THP+ salt) and a primary, secondary or tertiary alcohol having an acetylenic bond in the carbon backbone. The invention also provides the use of such a formulation for treating corrosion of mild steel, copper or aluminium, and a method for treatment of an aqueous system containing or in contact with a metal sulphide scale while concomitantly inhibiting the corrosion of surfaces in contact with said aqueous system, which method comprises the addition to said aqueous system of a scale and corrosion inhibiting amount of such a formulation.

Abstract: The present invention relates to a method of treating an aqueous system containing or in contact with metal sulphide scale. The method comprises adding to said system, separately or together, sufficient of a synergistic mixture comprising a THP+ salt, an aqueous solution of a strong acid (and optionally a source of nitrogen) to provide a solution containing from 0.1% to 30% by weight of the THP+ salt at a pH of less than about 1.0. The scale is contacted with said solution, (thereby dissolving at least part of said scale in said solution) and the dissolved scale is withdrawn from the system.

Abstract: A formulation comprising a THP+salt and a thio-substituted compound. The formulation is suitable for use in the treatment of corrosion and metal sulphide scale deposits in aqueous systems. The thio-substituted compound may be a thio-substituted carboxylic acid or salt, a thio-substituted sulphonic acid, a substituted or unsubstituted alkyl or aryl thiol, a thio-substituted heterocyclic compound or a mercaptoethanol.

Abstract: A corrosion inhibitor for use in a aqueous system is provided. In particular, the invention especially relates to a compound for use as a white rust corrosion inhibitor and to a composition including such a compound. The white rust corrosion inhibiting compound consists of an organo phosphonate having the general formula (I).