Abstract: An electrolyte for removing metal-carbide/nitride coatings or metal-carbide-nitride coatings from substrates, the electrolyte includes an acid, an inhibiter and a complexant. The acid is a mixture of a sulfuric acid and a weak acid. The inhibiter is an organic compound containing hydrophilic group, lipophilic group, and at least one polar group selected from nitrogen-containing group, sulfur-containing group, and hydroxyl group. The complexant is capable of complexing with Fe3+. A method for removing the metal-carbide/nitride coatings or metal-carbide-nitride coatings using the electrolyte is also provided.

Abstract: A wear of an electrode is prevented as much as possible, thereby efficiently electrolyzing a sulfuric acid solution and the like. An electrolysis method includes: passing an electrolytic solution through an electrolysis cell including at least a pair of an anode and a cathode; and supplying the electrodes with an electric power, so as to electrolyze the electrolytic solution, wherein a viscosity of the electrolytic solution is set in a range in response to a current density upon the electric power supply to carry out the electrolysis. The viscosity of a sulfuric acid solution as the electrolytic solution is equal to or less than 10 cP when the current density is equal to or less than 50 A/dm2, the viscosity of the sulfuric acid solution is equal to or less than 8 cP when the current density is from more than 50 to 75 A/dm2, and the viscosity of the sulfuric acid solution is equal to or less than 6 cP when the current density is from more than 75 to 100 A/dm2.

Abstract: An electrolytic method and apparatus for treating a solution sample allowing for the accurate and substantially real-time and on-line analysis of trace contaminants in the solution sample. The method of the present invention includes two stages. The solution sample is electrolyzed during a first stage to decompose the matrix, thereby substantially neutralizing the matrix, while during a second stage deposited or precipitated metals are recovered and/or stabilized in solution. An apparatus for carrying out the method is also disclosed.

Abstract: Suppression and removal of scales are efficiently carried out in a steel material hot rolling process and the time of pickling treatment as a successive step is greatly shortened. In a water cooling step of metallic material 11 at a temperature of 100° to 1,200° C., scales are removed by applying a direct current or an alternating current to metallic material 11 at 0.1 to 105 A/m2 of unit surface area from pinch rolls 2 to rolls 6 or apron guides 7 on the outlet side of a hot rolling mill 1 and/or by injecting cooling water at a pH value of −2 to 4 onto the metallic material 11 from cooling headers 4 and apron guides 7.

Abstract: A device and method for removing metal or mineral deposits from surfaces (eg. surfaces of oil drilling equipment) by creating an electrochemical cell of which the contaminated surface is a part.

Abstract: A method of manufacturing a metallic fiber in which from a convergent extended wire, which is formed by a metallic fiber and a matrix member which is formed of a metallic material and whose dissolvability is higher than the dissolvability of the metallic fiber, the matrix member is continuously dissolved and removed by an electrolytic processing in a plurality of electrolytic tanks which are arranged in the conveying direction of the convergent extended wire, wherein: the convergent extended wire is passed through electrolytes in the plurality of electrolytic tanks, which are arranged in the shape of a gentle convex arch at the vertical direction upper side which includes the conveying passage of the convergent extended wire, the convergent extended wire is passed above a plurality of feeding devices which are provided at the outer sides of the electrolytes and which are disposed in the same arch-shape so as to correspond to the electrolytic tanks, in each of the plurality of electrolytic tanks, the metallic

Abstract: A process for treating the surface of material composed of high-grade steel, particularly strip-shaped material, wherein the material is treated with a pickling solution in a least one container and is subsequently rinsed. The solution used as the pickling solution contains a hydrochloric acid as the only acid and the material to be treated is subjected in at least one container to a least one spray treatment with the pickling solution containing the hydrochloric acid.

Abstract: The invention concerns a process for pickling material strips made of steel, in particular stainless steel, where the strip passes through at last one pickling bath with at least one pickling acid. It is above all characterized by the fact that the acid concentration and/or the acid composition is controlled as a function of the material quality, of the pre-treatment and of the operating parameters of the pickling plant. Furthermore, the invention concerns a plant for carrying out the process, where at least two circulation tanks having different acid concentrations and/or acid compositions are provided.

Abstract: A method and a device for performing the method of electrolytic pickling of a metal strip. The metal strip continuously passes through an electrolyte bath which has an electrolyte circulating through a closed system. Crevices are formed on both sides of the metal with electrodes which are located above the top crevice and below the bottom crevice. The electrodes are of opposite polarity and are chemically resistant to the electrolyte. An electrical current is passed from one electrode, through one crevice, through the metal, through the other crevice and to the other electrode which results in the electrolytic pickling of the metal.