Suppression Method for Corrosion of Carbon Steel Member

A suppression method for corrosion of a carbon steel member, comprising steps of:

• forming a nickel metal film on a surface of the carbon steel member composing a plant;
• forming a nickel ferrite film on a surface of the formed nickel metal film;
• and
• after the formation of the nickel ferrite film, transforming the nickel metal film into a nickel ferrite film,
• wherein the steps of forming the nickel metal film, and forming the nickel ferrite film on the surface of the nickel metal film are performed in a period when operation of the plant is being shut down, and the step of transforming the nickel metal film into the nickel ferrite film is performed when the plant is in operation.

A suppression method for corrosion of a carbon steel member, comprising steps of:

• connecting a pipe having a pump to a piping including the carbon steel member composing a plant;
• forming a nickel metal film on an inner surface of the piping by supplying a first film forming liquid containing nickel ions, whose pH is adjusted to a value in a range between 4.0 and 9.0, into the piping through the pipe;
• forming a nickel ferrite film on a surface of the nickel metal film formed on the inner surface of the piping by supplying a second film forming liquid including a first agent containing iron (II) ions, a second agent containing nickel ions, and a third agent for oxidizing the iron (II) ions, whose pH is adjusted by addition of a pH adjustment agent to a value within a range of more than 5.5 to 9.0 or less, into the piping through the pipe;
• removing the pipe from the piping after the formation of the nickel ferrite film;
• and
• after the formation of the nickel ferrite film, transforming the nickel metal film into a nickel ferrite film,
• wherein the steps of connecting the pipe, forming the nickel metal film, forming the nickel ferrite film, and removing the pipe are performed in a period when operation of the plant is being shut down, and the step of transforming the nickel metal film into the nickel ferrite film is performed when the plant is in operation.