The present invention relates to a steel sheet with improved yellowing resistance and phosphatability, wherein the steel sheet contains 0.5% by weight or more of Mn, and contains 0.01 to 10 mg/m.sup.2 of Ca+Mg, 0.01 to 10 mg/m.sup.2 of P, 0.01 to 20 mg/m.sup.2 of C, and 0.05 to 30 mg/m.sup.2 of O as components excluding a steel component on the surface of the steel sheet after pickling, water rinsing, and drying. According to the present invention, in a manufacturing process of the steel sheet, the surface of the steel sheet is subjected to a chemical conversion treatment for improving phosphatability and yellowing resistance in a water-cooling section or a water-washing section, thereby having an effect of improving the surface quality of products using same and various subsequently treated products.

Provided is a method for forming a multilayer coating film.

Provided is a method for forming a multilayer coating film including the following steps (1) to (4): (1) applying a base paint (X) to a substrate to form a base coating film; (2) applying a specific effect pigment dispersion (Y) to the base coating film formed in step (1) to form an effect coating film with a specific dry film thickness; (3) applying a clear paint (Z) to the effect coating film formed in step (2) to form a clear coating film; and (4) heating the uncured base coating film, the uncured effect coating film, and the uncured clear coating film formed in steps (1) to (3) to simultaneously cure these three coating films.

A coating with strong adhesion for medical magnesium alloys, including a magnesium phosphate or calcium phosphate layer as an inner layer and a hydrophobic polymer layer as an outer layer. The inner layer is attached to the medical magnesium alloy; and the outer layer is attached to the inner layer. A preparation method of the coating is also provided, including: (S1) carrying out surface treatment on a medical magnesium alloy substrate; (S2) preparing a solution including magnesium salt/calcium salt and phosphoric acid/phosphate followed by pH adjustment and heating; (S3) soaking the medical magnesium alloy substrate in the solution followed by washing and drying to obtain a magnesium phosphate/calcium phosphate layer-coated medical magnesium alloy sample; and (S4) depositing a hydrophobic polymer layer on the medical magnesium alloy sample through chemical vapor deposition (CVD).

This coated metal sheet for exterior covering has a metal sheet and a top coating layer disposed on the metal sheet, the top coating layer is configured from a fluororesin and contains a gloss control agent comprising 0.01-15 vol % of microporous particles and a matte agent comprising primary particles, and the coated metal sheet satisfies the belowmentioned formulae. In the number-based particle size distribution of the gloss control agent and the matte agent, R is the number average particle size (μm) of the gloss control agent, D1.sub.97.5 and D2.sub.97.5 represent the 97.5% particle size (μm) of the gloss control agent and the matte agent, Ru is the upper limit particle size (μm) of the gloss control agent, and T is the top coating layer thickness (μm).

D1.sub.97.5/T≦0.9

Ru≦1.2T

R≧1.0

0.5≦D2.sub.97.5/T≦7.0

3≦T≦40.

An object is to provide an aqueous coating material composition having high viscosity expression property as well as a viscosity property of decreasing viscosity with increase in shear velocity; in particular, to provide an aqueous coating material composition that can form a multilayer coating film having excellent smoothness, clarity, flip-flop property, adhesion, and water resistance; in addition, to provide a method for forming a multilayer coating film using such aqueous coating material composition, as well as a coated article that has been coated with such aqueous coating material composition. As a solution, an aqueous coating material composition is provided that contains a polyester resin (A), acrylic resin particles (B), a curing agent (C), and a coloring pigment (D), wherein the polyester resin (A) is a resin containing a trifunctional or higher polyfunctional polycarboxylic acid (a1) and a polyol (a2) as monomer components.

A high-solid-content coating composition including: (A) an acrylic resin containing a hydroxyl group and an alkoxysilyl group; (B) a polyester resin containing a hydroxyl group; and (C) a polyisocyanate compound, in which the acrylic resin (A) containing a hydroxyl group and an alkoxysilyl group is contained in an amount of 20 to 50 parts by mass per 100 parts by mass of resinous solid components of the high-solid-content coating composition, the polyester resin (B) containing a hydroxyl group has an acid value of 10 mg-KOH/g or less, a hydroxyl value of 180 to 300 mg-KOH/g, and a number-average molecular weight of 400 to 1,500, and the coating composition, when being applied, has a solid content of 50 mass % or more.

Improved aluminum can end stock (CES) is disclosed. The CES includes an adhered polymer coating exhibiting low feathering and high performance in various acid tests. The low feathering and resistance to acid tests is accomplished by incorporating a copolymer adhesion promoter film to an aluminum alloy before lamination. In some cases, the metal strip is pretreated with a conversion layer, which can include compounds of trivalent chromium (Cr(III)) and phosphates or titanium and zirconium.

Provided are: a hydrophilization treatment agent; and a method for forming a hydrophilic coating film, which are capable of forming a coating film which has excellent hydrophilicity and water droplet removal properties and can maintain the excellent water drop removal properties. A polyetheramine is added to a specific aqueous resin dispersion and crosslinkable fine particles in a specific composition. Specifically, this hydrophilization treatment agent contains an aqueous resin dispersion (A), crosslinkable fine particles (B), and a polyetheramine (C), wherein: the aqueous resin dispersion (A) contains an ethylene-vinyl alcohol copolymer (A1) as a resin solid content and a radical polymer (A2) having a structural unit derived from a radically polymerizable carboxylic acid monomer (A2-1); ((A1)/(A2)) is 0.43-2.33; ((B)/(resin solid content of (A)) is 0.11-1.43; and ((C)/((resin solid content of (A))+(B))) is 0.1-0.38.

A process for producing a coated electrical steel strip includes application of a pretreatment layer over a first flat side of a rolled electrical steel strip. The layer thickness of the pretreatment layer is in the range from 10 nm to 100 nm, in particular from 20 nm to 50 nm. The rolled electrical steel strip which has been coated with the pretreatment layer is then coated with an insulating lacquer layer over the pretreatment layer. The insulating lacquer layer is applied by roll application using a roll and no deliberate drying and/or crosslinking of the pretreatment layer is carried out after application of the pretreatment layer and before coating with the insulating lacquer layer.