An anti-coking nanomaterial based on a stainless steel surface. In percentage by weight, the nanomaterial comprises: 0 to 3% of carbon, 23% to 38% of oxygen, 38% to 53% of chromium, 10% to 35% of ferrum, 0 to 2% of molybdenum, 0 to 4% of nickel, 3.5 to 5% of silicon, 0 to 1% of calcium, and the balance of impurity elements. Also disclosed are a preparation method for the anti-coking nanomaterial, the anti-coking nanomaterial that is based on a stainless steel surface and that is prepared by using the preparation method, and a stainless steel substrate comprising the anti-coking nanocrystalline material.

The present invention discloses a method and a composition for removing metal sulfide scale present on the surface of a metal, said method comprising: providing a liquid composition comprising: a chelating agent and a counterion component selected from the group consisting of: sodium gluconate; gluconic acid; tetrasodium EDTA; EDTA; propylenediaminetetraacetic acid (PDTA); nitrilotriacetic acid (NTA); N-(2-hydroxyethyl) ethylenediaminetriacetic acid (HEDTA); diethylenetriaminepentaacetic acid (DTPA); hydroxyethyliminodiacetic acid (HEIDA); cyclohexylenediaminetetraacetic acid (CDTA); diphenylaminesulfonic acid (DPAS); ethylenediaminedi(o-hydroxyphenylacetic) acid (EDDHA); glucoheptonic acid; gluconic acid; oxalic acid; malonic acid; succinic acid; glutaric acid; adipic acid; pimelic acid; suberic acid; azelaic acid; sebacic acid; phthalic acid; terephthalic acid; aconitic acid; carballylic acid; trimesic acid; isocitric acid; citric acid; L-glutamic acid-N,N-diacetic acid (GLDA); salts thereof; and mixtures thereof; and an aldehyde; and water exposing a surface contaminated with said metal sulfide scale to the liquid composition; allowing sufficient time of exposure to remove said metal sulfide scale from the contaminated surface and sequestration of the sulfur ions from solution.

The present invention discloses a method and a composition for removing metal sulfide scale present on the surface of a metal, said method comprising: providing a liquid composition comprising: a chelating agent and a counterion component selected from the group consisting of: sodium gluconate; gluconic acid; tetrasodium EDTA; EDTA; propylenediaminetetraacetic acid (PDTA); nitrilotriacetic acid (NTA); N-(2-hydroxyethyl) ethylenediaminetriacetic acid (HEDTA); diethylenetriaminepentaacetic acid (DTPA); hydroxyethyliminodiacetic acid (HEIDA); cyclohexylenediaminetetraacetic acid (CDTA); diphenylaminesulfonic acid (DPAS); ethylenediaminedi(o-hydroxyphenylacetic) acid (EDDHA); glucoheptonic acid; gluconic acid; oxalic acid; malonic acid; succinic acid; glutaric acid; adipic acid; pimelic acid; suberic acid; azelaic acid; sebacic acid; phthalic acid; terephthalic acid; aconitic acid; carballylic acid; trimesic acid; isocitric acid; citric acid; L-glutamic acid-N,N-diacetic acid (GLDA); salts thereof; and mixtures thereof; and an aldehyde; and water exposing a surface contaminated with said metal sulfide scale to the liquid composition; allowing sufficient time of exposure to remove said metal sulfide scale from the contaminated surface and sequestration of the sulfur ions from solution.

A pickling installation for applying a pickling treatment to a metal strip in continuous movement, the pickling treatment using an acid solution, the pickling installation including: a plurality of cascading treatment tanks among which at least one treatment tank includes a spray/injection section for spraying/injecting the acid solution on the metal strip; and collection means for retrieving the sprayed acid solution after use and redirecting the sprayed acid solution to each spray/injection section. The at least one treatment tank has a first header in front of a first face of the metal strip and a second header in front of a second face of the metal strip. In a first treatment tank configuration, each of the first header and the second header have an internal flat surface intended to be parallel respectively to first and second faces of metal strip, and at a distance thereof.

A pickling installation for applying a pickling treatment to a metal strip in continuous movement, the pickling treatment using an acid solution, the pickling installation including: a plurality of cascading treatment tanks among which at least one treatment tank includes a spray/injection section for spraying/injecting the acid solution on the metal strip; and collection means for retrieving the sprayed acid solution after use and redirecting the sprayed acid solution to each spray/injection section. The at least one treatment tank has a first header in front of a first face of the metal strip and a second header in front of a second face of the metal strip. In a first treatment tank configuration, each of the first header and the second header have an internal flat surface intended to be parallel respectively to first and second faces of metal strip, and at a distance thereof.

The present invention is in the field of chemical cleaning and surface treatments for a stainless steel substrate. In particular, the present invention provides a method, kit and use of specific solutions for removing rouging (class I, II and/or III) and/or blacking from a stainless steel substrate, which may be used as processing station or production unit.

The present invention is in the field of chemical cleaning and surface treatments for a stainless steel substrate. In particular, the present invention provides a method, kit and use of specific solutions for removing rouging (class I, II and/or III) and/or blacking from a stainless steel substrate, which may be used as processing station or production unit.

A nanocrystalline material based on a stainless steel surface. In percentage by weight, the nanocrystalline material comprises: 0 to 3% of carbon, 20% to 35% of oxygen, 40% to 53% of chromium, 10% to 35% of ferrum, 0 to 4% of molybdenum, 1% to 4% of nickel, 0 to 2.5% of silicon, 0 to 2% of calcium, and the balance of impurity elements. Also disclosed is a preparation method for the nanocrystalline material, and the nanocrystalline material that is based on a stainless steel surface and that is prepared by using the preparation method.

A detergent composition for metal product, which contains an amine (component A) represented by a general formula (I), a salt (component B′) of a dicarboxylic acid (component B) represented by a general formula (II): HOOC—R.sup.4—COOH (II) and the amine (component A), a salt (component C′) of a monocarboxylic acid (component C) represented by a general formula (III): R.sup.5—COOH (III) and the amine (component A), a nonionic surfactant (component D) represented by a general formula (IV): R.sup.6—O-{(EO)n/(PO)m}-H (IV), and water (component E) and has a pH of more than 7 and 10 or less. The detergent composition for metal product exhibits excellent detergency and metal corrosion suppressing performance.

Treatment solutions and methods for improving adhesion of gold electroplating onto metal surfaces are provided herein. More specifically, the disclosure relates to micro-etching stainless steel surfaces using to remove any organic contamination and chromium oxide formed on the surface, neutralize and strip the surface of any iron content, and repassivate the surface with a thin chromium oxide layer, prior to gold electroplating of the stainless steel surfaces.