A composition for pickling a welded portion and a rust-generated portion according to installation of pipes, structures, plants, and so on formed of stainless steel, and for forming a passive state film thereon is provided. More particularly, the present disclosure relates to a neutral agent for passivating a surface of stainless steel metal in which a neutral agent is obtained by neutralizing a basic aqueous solution to 6.9 pH to 7.1 pH and aerated with carbon dioxide-free air to increase the amount of dissolved oxygen, so that an oxidation reduction potential in a range of 170 mV to 310 mV is obtained.

A method includes applying flux solution during a soldering process. Metal ions are dissolved into the flux solution as a result of the soldering process. The method also includes rinsing the flux solution with a first rinse solution. The first rinse solution includes organic and/or sulfur species, and the organic and/or sulfur species stabilize the metal ions that are dissolved in the flux solution.

The present invention relates to the field of sheet hot stamping and sheet metal parts manufacturing, and provides a hot bath forming process for high-corrosion-resistance easy-to-weld hot-pressed parts. The process comprises the following steps: S1, heating a coated hot-formed steel sheet material in a heating furnace, and heating to a completely austenitized state; S2, transferring the heated coated hot-formed steel sheet material into a boiling water tank, immersing the heated coated hot-formed steel sheet material into boiling water, and cleaning an oxide layer; S3, forming the coated hot-formed steel sheet material under the combined action of boiling water and an upper mold and a lower mold, and performing pressure maintaining and quenching to obtain parts; and S4, taking out the parts for air blowing or drying the parts in a drying furnace to remove water in the coating of the parts. According to the process provided in the present invention, the sheet material is immersed in boiling water, the surface oxide layer is uniformly and controllably removed by means of bubbles generated between the boiling water and the hot sheet material, and the forming temperature of the sheet material is uniformly and accurately controlled; moreover, forming and quenching are performed in boiling water, so that the production quality of the parts can be improved, the service life of the mold is prolonged, and the production cost is saved.

A method for improving the adhesive capacity of a protectively coated steel sheet is proposed, in which, in a continuous process, a protective coating based on ZnAlMg is applied to the steel sheet and, in a further step, the protective coating undergoes a surface treatment in which an aqueous composition is applied in order to modify the natural oxide layer, which contains Al.sub.2O.sub.3 and MgO, without pickling this natural oxide layer as a result. In order to significantly increase adhesive capacity of the protectively coated steel sheet, the invention proposes skin-pass rolling the protectively coated steel sheet and then reacting the natural oxide layer with an aqueous fluoride-containing composition, reducing its MgO content in order to thus modify the natural oxide layer.

A method for improving the adhesive capacity of a protectively coated steel sheet is proposed, in which, in a continuous process, a protective coating based on ZnAlMg is applied to the steel sheet and, in a further step, the protective coating undergoes a surface treatment in which an aqueous composition is applied in order to modify the natural oxide layer, which contains Al.sub.2O.sub.3 and MgO, without pickling this natural oxide layer as a result. In order to significantly increase adhesive capacity of the protectively coated steel sheet, the invention proposes skin-pass rolling the protectively coated steel sheet and then reacting the natural oxide layer with an aqueous fluoride-containing composition, reducing its MgO content in order to thus modify the natural oxide layer.

The present disclosure relates to compositions, systems and methods for removing iron sulfide scale from a solid object, such as an oilfield component. The compositions include a carbon-carbon (CC) double bond with an electron withdrawing group bonded to at least one of the double-bonded carbons.

The present disclosure relates to compositions, systems and methods for removing iron sulfide scale from a solid object, such as an oilfield component. The compositions include a carbon-carbon (CC) double bond with an electron withdrawing group bonded to at least one of the double-bonded carbons.

The present disclosure relates to compositions, systems and methods for removing iron sulfide scale from a solid object, such as an oilfield component. The compositions include a carbon-carbon (CC) double bond with an electron withdrawing group bonded to at least one of the double-bonded carbons.

The invention relates to a thermal barrier coating removal method. A metal component (32) having a thermal barrier coating is located in a vessel (12) for containing an inert liquid reservoir. The vessel (12) has a releasably sealable closure (14) so as to allow the vessel interior to be maintained at an elevated pressure in use. The vessel is heated and the liquid therein is maintained at a temperature greater than 100 C. for an extended period of time such that thermal barrier coating breaks up as a result of internal stress caused by a crystal structure change in the thermal barrier coating.

The invention relates to a thermal barrier coating removal method. A metal component (32) having a thermal barrier coating is located in a vessel (12) for containing an inert liquid reservoir. The vessel (12) has a releasably sealable closure (14) so as to allow the vessel interior to be maintained at an elevated pressure in use. The vessel is heated and the liquid therein is maintained at a temperature greater than 100 C. for an extended period of time such that thermal barrier coating breaks up as a result of internal stress caused by a crystal structure change in the thermal barrier coating.