A sliding member includes, on a surface of a metal substrate, a surface-treated layer including a zinc-electroplated layer, a chemical conversion-treated layer, and a topcoat layer sequentially stacked on the metal substrate. The chemical conversion-treated layer includes chromium and oxygen. The topcoat layer includes at least one material selected from the group consisting of a silica compound, acrylic resin, polyurethane resin, epoxy resin, phenol resin, and melamine resin. A method of manufacturing the sliding member includes a step of forming, on a surface of the chemical conversion-treated layer, the topcoat layer including at least one material selected from the group consisting of a silica compound, acrylic resin, polyurethane resin, epoxy resin, phenol resin, and melamine resin.

A sliding member includes, on a surface of a metal substrate, a surface-treated layer including a zinc-electroplated layer, a chemical conversion-treated layer, and a topcoat layer sequentially stacked on the metal substrate. The chemical conversion-treated layer includes chromium and oxygen. The topcoat layer includes at least one material selected from the group consisting of a silica compound, acrylic resin, polyurethane resin, epoxy resin, phenol resin, and melamine resin. A method of manufacturing the sliding member includes a step of forming, on a surface of the chemical conversion-treated layer, the topcoat layer including at least one material selected from the group consisting of a silica compound, acrylic resin, polyurethane resin, epoxy resin, phenol resin, and melamine resin.

According to one aspect of the present invention, there is provided a chemical conversion coated metal sheet for non-condensed thermoplastic resin bonding, the chemical conversion coated metal sheet including a metal substrate and a chemical conversion coating film disposed on at least one surface of the metal substrate, in which the chemical conversion coating film is obtained by coating the metal substrate with a coating liquid that contains an ethylene-acrylic acid copolymer, colloidal silica, and a silane coupling agent. The ethylene-acrylic acid copolymer has an acrylic acid content of 10 mass % or more and a melt flow rate of 80 g/10 min or less.

According to one aspect of the present invention, there is provided a chemical conversion coated metal sheet for non-condensed thermoplastic resin bonding, the chemical conversion coated metal sheet including a metal substrate and a chemical conversion coating film disposed on at least one surface of the metal substrate, in which the chemical conversion coating film is obtained by coating the metal substrate with a coating liquid that contains an ethylene-acrylic acid copolymer, colloidal silica, and a silane coupling agent. The ethylene-acrylic acid copolymer has an acrylic acid content of 10 mass % or more and a melt flow rate of 80 g/10 min or less.

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 pre-treatment composition for use before etching SiGe includes an acid, an alcohol, and a silane compound having a chemical formula RSi(R.sup.1).sub.n(OR.sup.2).sub.3-n in which R is (C3-C20)alkyl, (C6-C12)aryl, (C6-C12)aryl(C3-C20)alkyl, or (C3-C20)alkyl(C6-C12)aryl, R.sup.1 is hydrogen, hydroxyl, halogen, (C1-C20)alkyl, halo(C1-C20)alkyl, (C6-C12)aryl, (C6-C12)aryl(C1-C20)alkyl, or (C1-C20)alkyl(C6-C12)aryl, R.sup.2 is hydrogen, (C1-C20)alkyl, halo(C1-C20)alkyl, (C6-C12)aryl, (C6-C12)aryl(C1-C20)alkyl, or (C1-C20)alkyl(C6-C12)aryl, n is an integer of 0 to 2, and the alkyl, aryl, arylalkyl, or alkylaryl of R, and the alkyl, haloalkyl, aryl, arylalkyl, or alkylaryl of R.sup.1 may be further substituted with at least one substituent selected from halogen, hydroxyl, N(R.sup.11)(R.sup.12), and S(R.sup.13), where each of the R.sup.11, the R.sup.12 and the R.sup.13 is independently hydrogen or (C1-C20)alkyl.

A pre-treatment composition for use before etching SiGe includes an acid, an alcohol, and a silane compound having a chemical formula RSi(R.sup.1).sub.n(OR.sup.2).sub.3-n in which R is (C3-C20)alkyl, (C6-C12)aryl, (C6-C12)aryl(C3-C20)alkyl, or (C3-C20)alkyl(C6-C12)aryl, R.sup.1 is hydrogen, hydroxyl, halogen, (C1-C20)alkyl, halo(C1-C20)alkyl, (C6-C12)aryl, (C6-C12)aryl(C1-C20)alkyl, or (C1-C20)alkyl(C6-C12)aryl, R.sup.2 is hydrogen, (C1-C20)alkyl, halo(C1-C20)alkyl, (C6-C12)aryl, (C6-C12)aryl(C1-C20)alkyl, or (C1-C20)alkyl(C6-C12)aryl, n is an integer of 0 to 2, and the alkyl, aryl, arylalkyl, or alkylaryl of R, and the alkyl, haloalkyl, aryl, arylalkyl, or alkylaryl of R.sup.1 may be further substituted with at least one substituent selected from halogen, hydroxyl, N(R.sup.11)(R.sup.12), and S(R.sup.13), where each of the R.sup.11, the R.sup.12 and the R.sup.13 is independently hydrogen or (C1-C20)alkyl.

A liquid passivation mixture for passivating an outer layer of a substrate comprises a first material selected from group consisting of sulfur or selenium and a base selected from a group consisting of quaternary ammonium compound, sodium hydroxide (NaOH), potassium hydroxide (KOH), and amine.

The invention relates to a method for producing a silane-modified silicate. In order to obtain optimal corrosion protection properties, a silane compound according to the invention is at least partially hydrolyzed and/or condensed in the presence of a silicate compound at a pH value greater than or equal to 8 and then a pH value less than or equal to 7 is set by adding acid. The invention further relates to an aqueous acidic passivation composition for metal substrate coated with the passivation composition.

The present invention discloses a durable super-hydrophobic manganese dioxide coating and a preparation method thereof, belonging to the field of metallic material surface treatment. In the method, by using manganese sulfate as a raw material, based on the property of interface reaction, a manganese dioxide coating is synthesized on the metallic material surface by simple and convenient solution impregnation, and then processed by hydrophobization with stearic acid to obtain a super-hydrophobic manganese dioxide coating. This coating has excellent chemical stability to organic solvents such as n-hexane, isooctane, dodecane, tetradecane, and acids, alkali and salt solutions at different pH values, and exhibits great resistance against dynamic water shear and good durability, with broad application prospect.