Provided is a method for manufacturing a micropore filter usable as SCE. Stainless steel particles having particle diameters of 3 to 60 ?m are subjected to milling in a bead mill using zirconia beads to prepare powder having a flakiness of 0.03 to 0.4. The zirconia adhered to the surface of the powder is removed by pickling. A load of 10 to 15 kN is applied to 0.5 to 1.0 g of the pickled powder, thereby compacting the powder into a columnar compact body. The compact body is kept and fired in a vacuum atmosphere of 10.sup.?5 to 10.sup.?3 Pa at a temperature of 1000 to 1300? C. for 1 to 3 hours to form a sintered body. The sintered body is pressed into a pipe having an inner diameter of 0.90 to 0.99 times of the outer diameter of the sintered body, and extruded to obtain a micropore filter.

Disclosed is a method for continuous thermal treatment of a steel strip. The strip passes through consecutive thermal treatment chambers, is quickly cooled in at least one of the chambers by spraying liquid onto the strip, or by spraying a fluid made up of gas and liquid or spraying a combination of gas and liquid forming a mist. After quick cooling, a protective metal layer is deposited on the strip by dip coating. The cooling fluid strips iron oxides or other alloy elements contained in the steel to be treated, minimizing oxidation and reducing the oxides on the strip. Spray pressure and distance are chosen to facilitate the stripping property and the mechanical action of the sprayed fluid, reducing the layer of oxides on the strip. The temperature of the strip at the end of the cooling step is the temperature necessary for carrying out the desired treatment cycle.

A method for inhibiting corrosion on a steel surface by treatment with a solution comprising a citrus leaf extract and a leaf extract from a second plant is described. The citrus leaf extract may be from a Citruslimon (lemon) plant, and the second leaf extract may be from a saffron plant, an almond plant, a Psidium guajava plant, or an Origanum majorana plant. Methods of making and applying the leaf extracts to steel are discussed, as well as the electrochemical properties and corrosion inhibition of treated steel in the presence of a corrosive agent.

The present disclosure relates to compositions and methods for the removal of deposits from oilfield apparatus and wellbore surfaces. In particular, removal of deposits comprising heavy hydrocarbon materials and finely divided inorganic solids. The composition includes a mixture of a corrosion inhibitor component which is morpholine or a morpholine derivative having corrosion inhibitor properties, and a surfactant which is a quaternary ammonium compound having biocidal properties. Methods of removing a deposit from a surface or unplugging an oilwell which has been plugged with a deposit, are also included wherein the method comprising contacting the deposit with a composition as disclosed herein for a selected period of time.

A method for pickling a steel plate having a first steel plate portion and a second steel plate portion which is connected to a tail end of the first steel plate portion and which requires a longer time for pickling than the first steel plate portion when pickled under the same condition includes: a step of pickling the steel plate by immersing the steel plate in an acid solution in at least one pickling tank while conveying the steel plate; a step of circulating the acid solution, through a circulation line connected to any of the at least one pickling tank, between the pickling tank and an oxidizing device disposed in the circulation line; a step of oxidizing Fe.sup.2+ in the acid solution to Fe.sup.3+ by the oxidizing device using a gaseous oxidant; and a feeding start step of, upon switching from pickling of the first steel plate portion to pickling of the second steel plate portion, starting feeding of a liquid oxidant for oxidizing Fe.sup.2+ in the acid solution to Fe.sup.3+ to any of the at least one pickling tank or to the circulation line.

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 and preferably preventing the formation of rouging (e.g. class I, II and/or III) on a stainless steel substrate, which may be used as processing station or production unit.

The present invention provides a method of manufacturing a steel sheet using a detergent for a steel sheet having a good washing property for the oil stain even at a low temperature. The method of manufacturing of the present invention is a method of manufacturing a steel sheet, comprising: a washing step of soaking a steel sheet to which a stain is stuck in a detergent for a steel sheet for washing and a rinsing step of rinsing with water the steel sheet that is soaked and washed after the washing step, wherein the detergent for a steel sheet comprises: an alkali agent, one or more organic acid(s) or salt(s) selected from lactic acid, oxalic acid, citric acid, and salts of these, a nonionic surfactant represented by the general formula (1), one or more chelating agent(s) selected from gluconic acid, ethylenediaminetetraacetic acid, and salts of these, and water.

Disclosed is a method for continuous thermal treatment of a steel strip. The strip passes through consecutive thermal treatment chambers, is quickly cooled in at least one of the chambers by spraying liquid onto the strip, or by spraying a fluid made up of gas and liquid or spraying a combination of gas and liquid forming a mist. After quick cooling, a protective metal layer is deposited on the strip by dip coating. The cooling fluid strips iron oxides or other alloy elements contained in the steel to be treated, minimizing oxidation and reducing the oxides on the strip. Spray pressure and distance are chosen to facilitate the stripping property and the mechanical action of the sprayed fluid, reducing the layer of oxides on the strip. The temperature of the strip at the end of the cooling step is the temperature necessary for carrying out the desired treatment cycle.

A cleaning solution for a turbine engine includes water within a range between about 68.65 percent and about 99.63 percent by volume of the cleaning solution; a first organic acidic component within a range between about 0.1 percent and about 15 percent by volume of the cleaning solution; wherein the organic acid comprises citric acid; a second organic acidic component within a range between about 0.1 percent and about 15 percent by volume of the cleaning solution; wherein the organic acid comprises glycolic acid; isoropylamine sulphonate within a range between about 0.07 percent and 0.14 percent by volume of the cleaning solution; alcohol ethoxylate within a range between about 0.035 percent and 0.07 percent by volume of the cleaning solution; triethanol amine within a range between about 0.035 percent and 0.07 percent by volume of the cleaning solution; sodium lauriminodipropionate within a range between about 0.03 percent and 1.0 percent by volume of the cleaning solution. The cleaning solution has a pH value in the range between about 2.5 and about 7.0.

A method of preparing and decontaminating a substrate surface to remove contaminants including the steps of applying a first dry or fluid composition having a pH of 4 or less comprising an acidifier and an oxidizer, allowing the first composition to remain on the substrate surface for a predetermined period of time, and rinsing the first composition from the substrate surface with a second composition having a pH of 8 or more comprising an alkaline material liquid mixture formed utilizing activated carbon filtered potable water to achieve a neutral pH condition on the surface, and then applying a nanotubes coating on the surface.