Composition for washing pickled steel plate, method for washing pickled steel plate by using same, and steel plate obtained thereby
A composition for washing a pickled steel plate and a method for washing a pickled steel plate using the same are provided. The composition for washing a pickled steel plate includes a phosphoric acid ester compound, an amine-based compound, sodium carbonate, ammonium acetate, ethylene diamine tetraacetic acid (EDTA) and a remainder of water, and the method for washing a pickled steel plate is performed using the same.
1. A composition for washing a pickled steel plate comprising 15 to 24 wt % of a phosphoric acid ester compound, 5 to 15 wt % of citric acid, 2 to 10 wt % of sodium carbonate, 2 to 7 wt % of sodium acetate, 1 to 7 wt % of diethylene tetramine pentaacetic acid (DTPA) and a remainder of water.
2. The composition for washing of claim 1 , wherein the phosphoric acid ester compound is at least one compound selected from the group consisting of bisphenol A-bis(diphenyl phosphate), triaryl phosphate isopropylate, dimethylmethyl phosphate, tetraphenyl m-phenylene bis(phosphate), triethyl phosphate and triphenyl phosphate.
3. The composition for washing of claim 1 , wherein the composition for washing has a pH of at least 8.0.
4. The composition for washing of claim 1 , wherein the composition for washing has a pH of 8.5 to 11.5.
5. The composition for washing of claim 1 , wherein the composition when used for washing is diluted in an amount of 0.05 to 1.5 wt % with water.
6. A method for washing a pickled steel plate, comprising:
preparing a composition for washing a pickled steel plate by mixing 15 to 24 wt % of a phosphoric acid ester compound, 5 to 15 wt % of citric acid, 2 to 10 wt % of sodium carbonate, 2 to 7 wt % of sodium acetate, 1 to 7 wt % of diethylene tetramine pentaacetic acid (DTPA) and a remainder of water;
diluting the composition for washing with water; and
immersing the pickled steel plate in the composition for washing.
7. The method for washing of claim 6 , wherein the diluting the composition for washing with water is performed by diluting 0.05 to 1.5 wt % of the composition for washing with water.
8. The method for washing of claim 6 , wherein the phosphoric acid ester compound is at least one compound selected from the group consisting of bisphenol A-bis(diphenyl phosphate), triaryl phosphate isopropylate, dimethylmethyl phosphate, tetraphenyl m-phenylene bis(phosphate), triethyl phosphate and triphenyl phosphate.
9. The method for washing of claim 6 , wherein the composition for washing has a pH of at least 8.0.
10. The method for washing of claim 6 , wherein the composition for washing has a pH of 8.5 to 11.5.