A method for controlling water chemistry in a power generation plant including a low-pressure feedwater heater (18), a deaerator (19), and a high-pressure feedwater heater (20) disposed sequentially along a feedwater pipe (16) from a condenser (15) to a steam generator or a boiler (11) to control the chemistry of feedwater guided to the steam generator or the boiler includes the steps of: injecting an oxidant through an oxidant injection line (31) into feedwater flowing through the feedwater pipe disposed downstream of the condenser in such a way that a dissolved oxygen concentration in the feedwater ranges from 3 to 100 ppb while the feedwater is maintained to be neutral to form an oxide film on surfaces of the feedwater pipe, the low-pressure feedwater heater, the deaerator, the high-pressure feedwater heater, and other structural members that come into contact with the feedwater; and injecting a deoxidant through a deoxidant injection line (35) into the feedwater flowing through the feedwater pipe disposed downstream of the deaerator in such a way that the dissolved oxygen concentration in the feedwater flowing into the steam generator or the boiler lowers to 5 ppb or lower.

Methods and compositions are disclosed for inhibiting corrosion on metal surfaces of gas turbine air compressors. The methods comprise contacting the metal surfaces with a corrosion inhibiting composition comprising at least one filming amine.

Methods and compositions are disclosed for inhibiting corrosion on metal surfaces of gas turbine air compressors. The methods comprise contacting the metal surfaces with a corrosion inhibiting composition comprising at least one filming amine.

Provided are a surface protection composition which has excellent anticorrosion performance to prevent the metal corrosion, and also has excellent coating properties and heat resistance with suppressing cracks from being occurred even in a cold environment and maintaining anticorrosion performance, and a terminal-fitted electric wire using these.

The present protection composition contains: (a) a phosphorus compound represented by the following general formula (1) in an amount of 0.1 to 10 mass % in terms of phosphorus element with respect to the total amount of the composition; (b) a metal-containing compound in an amount of 0.1 to 10 mass % in terms of the metal element with respect to the total amount of the composition or an amine compound in an amount of 0.1 to 5.0 mass % in terms of nitrogen element with respect to the total amount of the composition; (c) a (meth) acrylate having two or more carbon-carbon double bonds and hydrocarbon chains having four or more carbon atoms in an amount of 1.0 to 70 mass % with respect to the total amount of the composition; (d) a mono (meth) acrylate having a hydrocarbon chain having seven or more carbon atoms in an amount of 1.0 to 80 mass % with respect to the total amount of the composition; and (e) at least one of a photopolymerization initiator and a thermal polymerization initiator in an amount of 0.1 to 10 mass % with respect to the total amount of the composition.

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In the above-presented general formula (1), R.sup.1 represents a hydrogen atom, R.sup.2 represents a hydrocarbon group having 4 to 30 carbon atoms, and R.sup.3 represents a hydrogen atom or a hydrocarbon group having 4 to 30 carbon atoms.

The present invention relates to a corrosion inhibitor and inhibitor provided within a coating material for coating a metal, particularly but not exclusively steel. The corrosion inhibitor in a coating particularly protects a sacrificial coating such as zinc or zinc alloy on galvanised steel which in turn therefore provides improved corrosion resistance to the underlying steel. According to an aspect of the invention there is a corrosion inhibitor provided in a polymer binder, the corrosion inhibitor comprising an organic ion in an ion exchange resin.

The present invention relates to a corrosion inhibitor and inhibitor provided within a coating material for coating a metal, particularly but not exclusively steel. The corrosion inhibitor in a coating particularly protects a sacrificial coating such as zinc or zinc alloy on galvanised steel which in turn therefore provides improved corrosion resistance to the underlying steel. According to an aspect of the invention there is a corrosion inhibitor provided in a polymer binder, the corrosion inhibitor comprising an organic ion in an ion exchange resin.

Provided is a method for preventing corrosion of a cable including a plurality of bundled wires and a covering tube which covers the plurality of wires, the method including a mixed gas generation step of mixing a low-oxygen gas having an oxygen concentration lower than an oxygen concentration of air with the air, and a mixed gas supply step of supplying the mixed gas into the covering tube to flow the mixed gas around each of the wires.

Provided is a method for preventing corrosion of a cable including a plurality of bundled wires and a covering tube which covers the plurality of wires, the method including a mixed gas generation step of mixing a low-oxygen gas having an oxygen concentration lower than an oxygen concentration of air with the air, and a mixed gas supply step of supplying the mixed gas into the covering tube to flow the mixed gas around each of the wires.

A central tubular defines a central flow passage and spray nozzles along an outer circumference of the central tubular. A first brush pig supports a first end of the central tubular. A second brush pig supports a second end of the tubular. An inflatable balloon is at the second end of the tubular. The inflatable balloon is encircled by the second brush pig. The inflatable balloon is configured to cause a first pressure drop across the balloon when in an inflated state and cause a second pressure drop, less than the first pressure drop, across the balloon when in a deflated state. A flow control system is at the first end of the tubular and is configured to regulate fluid exchange with the tubular and fluid exchange with the inflatable balloon.

A central tubular defines a central flow passage and spray nozzles along an outer circumference of the central tubular. A first brush pig supports a first end of the central tubular. A second brush pig supports a second end of the tubular. An inflatable balloon is at the second end of the tubular. The inflatable balloon is encircled by the second brush pig. The inflatable balloon is configured to cause a first pressure drop across the balloon when in an inflated state and cause a second pressure drop, less than the first pressure drop, across the balloon when in a deflated state. A flow control system is at the first end of the tubular and is configured to regulate fluid exchange with the tubular and fluid exchange with the inflatable balloon.