Rust-Removing/Preventing Agent, and Rust-Removing Method Using the Same

Abstract

Only by immersing a rusted metallic product into (a single liquid) of) a rust removing/preventing agent or painting the agent only on the rust on the surface thereof, the rust is completely removed. By drying the metallic product taken out from the liquid of the agent or wiping off the liquid without subjecting the rust-removed metal to any post-treatment such as washing, the effect of preventing rust is exhibited indoors and outdoors over a long term. Furthermore, the single liquid of the agent is caused to have two functions of rust-removal and rust-prevention. A rust-removing/preventing agent, comprising orthophosphoric acid, DL-malic acid, and a water, in which in the case that the total weight of the agent is assumed to be 1 kg, the weight of orthophosphoric acid is from 50 to 600 g, the weight of DL-malic acid is from 0.2 to 20 g, and the balance comprises the water.

1 : A rust-removing/preventing agent, comprising orthophosphoric acid, DL-malic acid, and water, wherein, in the case that the total weight of the rust-removing/preventing agent is assumed to be 1 kg, the weight of said orthophosphoric acid is from 50 to 600 g, the weight of said DL-malic acid is from 0.2 to 20 g, and the balance comprises said water. 
     
     
         2 : The rust-removing/preventing agent according to  claim 1 , further comprising sodium dihydrogen phosphate dihydrate. 
     
     
         3 : The rust-removing/preventing agent according to  claim 2 , wherein the weight of said sodium dihydrogen phosphate dihydrate is from 0.2 to 2 g. 
     
     
         4 : The rust-removing/preventing agent according to  claim 3 , wherein the water is processed water, molecular clusters of which are substantially uniform. 
     
     
         5 : The rust-removing/preventing agent according to  claim 4 , wherein the water is processed water, to which magnetism is applied. 
     
     
         6 : The rust-removing/preventing agent according to  claim 1 , further comprising a surfactant added at a weight of 0.1 to 1.5 g. 
     
     
         7 : The rust-removing/preventing agent according to  claim 6 , further comprising acetic acid added at a weight of 0.1 to 5.0 g. 
     
     
         8 : The rust-removing/preventing agent according to  claim 7 , further comprising an aliphatic acid added at a weight of 1.0 to 10 g. 
     
     
         9 : The rust-removing/preventing agent according to  claim 1 , further comprising acetic acid added at a weight of 0.1 to 5.0 g, or an aliphatic acid added at a weight of 1.0 to 10 g. 
     
     
         10 : The rust-removing/preventing agent according to  claim 1 , further comprising a surfactant added at a weight of 0.1 to 1.5 g, and an aliphatic acid added at a weight of 1.0 to 10 g. 
     
     
         11 : The rust-removing/preventing agent according to  claim 1 , further comprising acetic acid added at a weight of 0.1 to 5.0 g, and an aliphatic acid added at a weight of 1.0 to 10 g. 
     
     
         12 : A rust-removing method, comprising the steps of painting the rust-removing/preventing agent according to  claim 1  onto a mold, a column, or a ceiling face made of a metal material, and causing a piece of paper or nonwoven cloth which can hold the rust-removing/preventing agent without drying the agent for a predetermined time to adhere onto the painted rust-removing/preventing agent, thereby removing rust of the metal material. 
     
     
         13 : The rust-removing method according to  claim 12 , further comprising a step of painting the rust-removing/preventing agent onto the piece of the paper or nonwoven cloth. 
     
     
         14 : The rust-removing method according to  claim 13 , wherein the piece of the paper or nonwoven cloth is held on a surface of the column or ceiling which is made of iron by means of a magnetic sheet having a magnetic effect. 
     
     
         15 : The rust-removing method according to  claim 12 , wherein the piece of the paper or nonwoven cloth is held on a surface of the column or ceiling which is made of iron by means of a magnetic sheet having a magnetic effect. 
     
     
         16 : The rust-removing/preventing agent according to  claim 1 , wherein the water is processed water, molecular clusters of which are substantially uniform. 
     
     
         17 : The rust-removing/preventing agent according to  claim 16 , wherein the water is processed water, to which magnetism is applied. 
     
     
         18 : The rust-removing/preventing agent according to  claim 2 , wherein the water is processed water, molecular clusters of which are substantially uniform. 
     
     
         19 : The rust-removing/preventing agent according to  claim 18 , wherein the water is processed water, to which magnetism is applied.