This disclosure relates to hydrophobic metal phosphate ceramic comprising a Group IV element of silicon, germanium, tin, or lead having at least one hydrocarbon covalently bonded thereto. Methods of providing water proofing and/or anti-corrosion protection are provided.

The invention relates to a method for the anti-corrosion pre-treatment of a plurality of components in series, in which the components of the series are at least partially formed of iron and/or steel, and in which the components of the series each initially undergo a first conversion stage, followed by a rinsing stage and a subsequent second conversion stage, wherein, in the conversion stages, respective acidic aqueous conversion solutions based on compounds of the elements Zr and/or Ti dissolved in water are brought into contact with the components, and, additionally, copper ions are contained in the conversion solution for the second stage.

An aqueous, acidic, anti-corrosion conversion coating composition (in particular, an aqueous, acidic Group IV metal-containing anti-corrosion conversion coating composition) for metal substrates comprising as an additive a catechol compound and/or the reaction products of at least one catechol compound and at least one co-reactant compound having one or more functional groups reactive with the at least one catechol compound, desirably the reaction product of a catechol and an polyamine (e.g., a polyethyleneimine), that enhances the anti-corrosion effects of the conversion coating composition; methods of making and applying the conversion coating compositions and coated metal substrates. The catechol-containing conversion coating composition can be applied to metal substrate surfaces at temperatures as low as below 40? C. and with exposure times of 5 minutes or less. The catechol compound or reaction product thereof can become incorporated into the conversion coating formed on the metal substrate.

The tendency of a bare metal surface to oxidize (e.g., flash-rust) may be alleviated by contacting the bare metal surface with an aqueous mixture of at least one preformed reaction product obtained by reaction of at least one catechol compound, such as dopamine or a salt thereof, with at least one co-reactant compound functionalized with one or more functional groups reactive with the at least one catechol compound, such as (meth)acryl, primary amino, secondary amino, thiol and/or hydroxyl groups, with polyethyleneimine being an example of a suitable co-reactant compound. Such a rinsing procedure does not interfere with subsequent conversion coating of the metal surface.

The tendency of a bare metal surface to oxidize (e.g., flash-rust) may be alleviated by contacting the bare metal surface with an aqueous mixture of at least one preformed reaction product obtained by reaction of at least one catechol compound, such as dopamine or a salt thereof, with at least one co-reactant compound functionalized with one or more functional groups reactive with the at least one catechol compound, such as (meth)acryl, primary amino, secondary amino, thiol and/or hydroxyl groups, with polyethyleneimine being an example of a suitable co-reactant compound. Such a rinsing procedure does not interfere with subsequent conversion coating of the metal surface.

The corrosion resistance of conversion-coated metal substrate surfaces is further enhanced by treating such surfaces with aqueous mixtures of preformed reaction products obtained by reacting catechol compounds, such as dopamine or a dopamine salt, and functionalized co-reactant compounds, such as a polyethyleneimine.

The present invention relates to a method for the corrosion-protective and cleaning pretreatment of metallic components, produced at least partially from metallic materials from the elements iron, zinc and/or aluminum, with the use of an acid aqueous composition containing, in addition to the water-soluble compounds of the elements Zr and/or Ti causing the conversion of the metal surface, a mixture of an aliphatic diol and an aliphatic saturated polyhydroxy compound. It also comprises a chrome(VI)-free aqueous composition based on the constituents mentioned above which delivers outstanding results in cleaning and simultaneous corrosion-protective conversion of technical metal surfaces in one method step.

The present invention relates to a method for the corrosion-protective and cleaning pretreatment of metallic components, produced at least partially from metallic materials from the elements iron, zinc and/or aluminum, with the use of an acid aqueous composition containing, in addition to the water-soluble compounds of the elements Zr and/or Ti causing the conversion of the metal surface, a mixture of an aliphatic diol and an aliphatic saturated polyhydroxy compound. It also comprises a chrome(VI)-free aqueous composition based on the constituents mentioned above which delivers outstanding results in cleaning and simultaneous corrosion-protective conversion of technical metal surfaces in one method step.

A method for anti-corrosion treatment of components produced from aluminum, comprising a pre-treatment stage and subsequent painting. The pre-treatment stage includes steps of pickling and passivation wherein passivation of the components includes contacting them with an acidic, aqueous composition based on water-soluble compounds of the elements Zr and/or Ti. The pickling and passivation are coordinated with each other so that a re-dosing of active components of the passivation solution can occur in substantial parts from the pickling solution.

A method for anti-corrosion treatment of components produced from aluminum, comprising a pre-treatment stage and subsequent painting. The pre-treatment stage includes steps of pickling and passivation wherein passivation of the components includes contacting them with an acidic, aqueous composition based on water-soluble compounds of the elements Zr and/or Ti. The pickling and passivation are coordinated with each other so that a re-dosing of active components of the passivation solution can occur in substantial parts from the pickling solution.