Stain preventing method

Claim 1

A method for preventing stains due to adhesion of marine organisms to an article contacting with sea water, comprising the steps of: performing direct lining of a conductive sheet made of a conductive substance on a stain prevention-requiring portion of said article subjected to stain prevention; arranging an electrode member and a reference electrode in sea water so as not to contact with the conductive sheet; applying a direct electric current using the conductive sheet as an anode and the electrode member as a cathode and utilizing said article subjected to stain prevention as an electric current feeding member; allowing current to flow while measuring a potential difference between the reference electrode and the anode; and controlling the surface potential of the conductive sheet to be in a range of +0.5 to 1.5 V vs SCE so as to give electric shock to microorganisms which contact with the conductive sheet and thus prevent adhesion of microorganisms on said article.

Claim 2

A method for preventing stains due to adhesion of marine organisms to an article contacting with sea water, comprising the steps of: performing direct lining of a conductive sheet made of a conductive substance on a stain prevention-requiring portion of said article subjected to stain prevention; arranging an electrode member and a reference electrode in sea water so as not to contact with the conductive sheet; applying a direct electric current using the conductive sheet as an anode and the electrode member as a cathode and utilizing said article subjected to stain prevention as an electric current feeding member; allowing current to flow while measuring a potential difference between the reference electrode and the anode; and controlling the surface potential of the conductive sheet to be in a range of +0.5 to 1.5 V vs SCE so as to give electric shock to microorganisms which contact with the conductive sheet and thus prevent adhesion of microorganisms on said article.

Claim 3

A method for preventing stains due to adhesion of marine organisms to a net of contacting with sea water, comprising the steps of: forming a conductive coating film made of a conductive substance on the net arranging an electrode member and a reference electrode in sea water so as not to contact with the conductive coating film; applying a direct electric current using the conductive coating film as an anode and the electrode member as a cathode and utilizing the net as an electric current feeding member; allowing current to flow while measuring a potential difference between the reference electrode and the anode; and controlling the surface potential of the conductive coating film to be in a range of +0.5 to 1.5 V vs SCE so as to give electric shock to microorganisms which contact the conductive coating film and thus prevent adhesion of microorganisms on said net.

Claim 4

A method for preventing stains due to adhesion of marine organisms to a net of contacting with sea water, comprising the steps of: forming a conductive coating film made of a conductive substance on the net arranging an electrode member and a reference electrode in sea water so as not to contact with the conductive coating film; applying a direct electric current using the conductive coating film as an anode and the electrode member as a cathode and utilizing the net as an electric current feeding member; allowing current to flow while measuring a potential difference between the reference electrode and the anode; and controlling the surface potential of the conductive coating film to be in a range of +0.5 to 1.5 V vs SCE so as to give electric shock to microorganisms which contact the conductive coating film and thus prevent adhesion of microorganisms on said net.

Claim 5

A method for preventing stains due to adhesion of marine organisms to an article contacting with sea water, comprising the steps of: arranging an electric current feeding member lined with a conductive sheet or an electric current feeding member covered with a conductive coating film closely near to a stain prevention-requiring portion of an article subjected to stain prevention; arranging an electrode member and a reference electrode in sea water so as not to contact with the conductive sheet or the conductive coating film; applying direct electric current using the conductive sheet or the conductive coating film as an anode and the electrode member as a cathode and passing the electric current through the feeding member to the anode; allowing current to flow while measuring a potential difference between the reference electrode and the anode; and controlling the surface potential of the conductive sheet or the conductive coating film to be in a range of +0.5 to 1.5 V vs SCE so as to give electric shock to microorganisms which contact with the conductive sheet or the conductive coating film and thus prevent adhesion of microorganisms on said article.

Claim 6

A method for preventing stains due to adhesion of marine organisms to an article contacting with sea water, comprising the steps of: arranging an electric current feeding member lined with a conductive sheet or an electric current feeding member covered with a conductive coating film closely near to a stain prevention-requiring portion of an article subjected to stain prevention; arranging an electrode member and a reference electrode in sea water so as not to contact with the conductive sheet or the conductive coating film; applying direct electric current using the conductive sheet or the conductive coating film as an anode and the electrode member as a cathode and passing the electric current through the feeding member to the anode; allowing current to flow while measuring a potential difference between the reference electrode and the anode; and controlling the surface potential of the conductive sheet or the conductive coating film to be in a range of +0.5 to 1.5 V vs SCE so as to give electric shock to microorganisms which contact with the conductive sheet or the conductive coating film and thus prevent adhesion of microorganisms on said article.