Provided is a zinc-based plated steel sheet having a post-treated coating filmed thereon including: a steel sheet; a zinc plated layer formed on the steel sheet; and a post-treated coating formed on the plated layer, wherein the atomic ratio (O/M) of oxygen (O) to metals (M) contained in the post-treated coating is greater than 2 and less than 20, and a method for post-treating a zinc-based plated steel sheet. According to this, the zinc-based plated steel sheet having the post-treated coating formed thereon has the effects excellent in lubricity, weldability, adhesiveness, film-removing property and paintability. As the method of post-treating a zinc-based plated steel sheet of the present invention employs a simple coating method irrespective of the kind of plating layer, the process is simple and economical and the process operation cost is low.

Provided is a zinc-based plated steel sheet having a post-treated coating filmed thereon including: a steel sheet; a zinc plated layer formed on the steel sheet; and a post-treated coating formed on the plated layer, wherein the atomic ratio (O/M) of oxygen (O) to metals (M) contained in the post-treated coating is greater than 2 and less than 20, and a method for post-treating a zinc-based plated steel sheet. According to this, the zinc-based plated steel sheet having the post-treated coating formed thereon has the effects excellent in lubricity, weldability, adhesiveness, film-removing property and paintability. As the method of post-treating a zinc-based plated steel sheet of the present invention employs a simple coating method irrespective of the kind of plating layer, the process is simple and economical and the process operation cost is low.

A surface treatment apparatus includes a treatment vessel including a treatment space in which a metal component is disposed, a spray nozzle that supplies mist of a non-chromate conversion treatment liquid to the treatment space, and a circulation device that collects the non-chromate conversion treatment liquid from the treatment space and supplies the non-chromate conversion treatment liquid to the spray nozzle.

An aqueous acidic composition for treating metal surfaces, the composition including the following components: a) at least one water soluble or water dispersable anionic polyelectrolyte; b) at least one organofunctional silane including one or more reactive functional groups selected from the group including amino, mercapto, methacryloxy, epoxy and vinyl; c) at least one water dispersible solid wax
wherein the weight ratio between components a:b is in the range of 1:2-4:1, based on dry matter; the weight ratio between components (a+b):c is in the range of 1:3-3:1, based on dry matter, and wherein components a and b may be present—at least partially—as their graft reaction product. Another aspect is a treating method using this composition and use of the thus treated metal surface.

A method for constructing a micro-nano porous organic acid pretreatment layer on the metal surface and its application are provided. A pretreatment reagent used is prepared by chemically grafting organic acid with hydroxylation-rich polymer. After immersed in the pretreatment reagent for a period of time, the metal substrates are then dried and cured, and the organic acid pretreatment layer with a micro-nano porous structure and excellent adhesion is successfully formed. The present invention provides the pretreatment reagent and pretreatment process of the metal surface coating protection technology. The solvent is only pure water and realizes no organic solvation. The pretreatment layer has excellent adhesion with the metal substrate, rough and porous structure, and can be closely interlocked with the subsequent coating layer, which greatly enhances the anticorrosion performance of the whole coating system.

A method for constructing a micro-nano porous organic acid pretreatment layer on the metal surface and its application are provided. A pretreatment reagent used is prepared by chemically grafting organic acid with hydroxylation-rich polymer. After immersed in the pretreatment reagent for a period of time, the metal substrates are then dried and cured, and the organic acid pretreatment layer with a micro-nano porous structure and excellent adhesion is successfully formed. The present invention provides the pretreatment reagent and pretreatment process of the metal surface coating protection technology. The solvent is only pure water and realizes no organic solvation. The pretreatment layer has excellent adhesion with the metal substrate, rough and porous structure, and can be closely interlocked with the subsequent coating layer, which greatly enhances the anticorrosion performance of the whole coating system.

A method for passivating a metal surface including, generating an atmospheric plasma beam by electrical discharge in a working gas, introducing an acid-containing passivating agent into the plasma beam, applying the plasma beam containing the passivating agent to the metal surface, and depositing a passivating salt on the metal surface by a reaction between the acid-containing passivating agent and the metal surface. This method simplifies the process for passivating a metal surface and renders it more effective.

This disclosure discloses a durable super-hydrophobic manganese dioxide coating, belonging to the field of metallic material surface treatment. The super-hydrophobic manganese dioxide coating includes manganese dioxide microspheres and a stearic acid shell. The manganese dioxide microspheres are encased in the stearic acid shell. The manganese dioxide microspheres are stacked hierarchically on the metallic material surface.

This disclosure discloses a durable super-hydrophobic manganese dioxide coating, belonging to the field of metallic material surface treatment. The super-hydrophobic manganese dioxide coating includes manganese dioxide microspheres and a stearic acid shell. The manganese dioxide microspheres are encased in the stearic acid shell. The manganese dioxide microspheres are stacked hierarchically on the metallic material surface.

The present invention relates to a composition comprising —a specific binder containing at least one cocondensate based on at least one ω-glycidyloxyalkylalkoxysilane and a bis(alkoxyalkylsilyl)amine, —water, —alcohol in an amount of less than 3% by weight, based on the composition, —at least one addition selected from the group consisting of particulate metals, metal alloys and metal compounds and —optionally at least one additive, where the pH of the composition is from 1 to 14 and the dry residue of the binder is from 1 to 50% by weight, based on the binder used, a process for the production thereof and also the use thereof for coatings, in particular for the protection of metals against corrosion.