Methods for treating a ferrous metal substrate

Disclosed are methods for treating and coating a ferrous metal substrate, such as cold rolled steel, hot rolled steel, and electrogalvanized steel. These methods include contacting the ferrous metal substrate with an aqueous pretreatment composition comprising: (a) a Group IIIB and/or IVB metal compound; (b) phosphate ions; and (c) water. Also disclosed are off-shift methods of removing iron from the pretreatment bath.

PRETREATMENT COMPOSITIONS AND METHODS OF TREATING A SUBSTRATE

Disclosed is a pretreatment composition containing (a) a Group IIIB metal, a Group IVB metal, or combinations thereof; and (b) a compound containing at least six phosphorus-containing acid groups or salts thereof; wherein the molar ratio of (a) to (b) is at least 3:1. Also disclosed are methods of treating a substrate with the pretreatment composition and substrates treated with the pretreatment composition. 1. A pretreatment composition comprising:(a) a Group IIIB metal and/or a Group IVB metal present in a total amount of 20 ppm to 1000 ppm (calculated as elemental metal) based on the total weight of the pretreatment composition; and{'sup': −4', '−2, '(b) a compound containing at least six phosphorus-containing acid groups or salts thereof present in an amount of 1.82×10moles per liter to 2.73×10moles per liter of pretreatment composition;'}wherein the molar ratio of (a) to (b) is at least 3:1.2. The pretreatment composition of claim 1 , wherein the Group IIIB and/or IVB metal comprise(s) zirconium claim 1 , titanium claim 1 , hafnium claim 1 , yttrium claim 1 , scandium claim 1 , or a mixture thereof.3. The pretreatment composition of claim 1 , wherein the compound containing at least six phosphorus-containing acid groups or salts thereof comprises phytic acid or salts thereof.4. The pretreatment composition of claim 1 , further comprising an electropositive metal in ionic form present in an amount of 2 ppm to 100 ppm based on the total weight of the pretreatment composition.5. The pretreatment composition of claim 1 , further comprising a fluoride source present in an amount of 25 ppm to 500 ppm (calculated as total fluoride) based on the total weight of the pretreatment composition.6. The pretreatment composition of claim 1 , further comprising an oxidizing agent present in an amount of 15 ppm to 300 ppm based on the total weight of the pretreatment composition.7. The pretreatment composition of claim 1 , further comprising a fluoride source claim 1 , an ...

METHODS FOR TREATING A FERROUS METAL SUBSTRATE

Disclosed are methods for treating and coating a ferrous metal substrate, such as cold rolled steel, hot rolled steel, and electrogalvanized steel. These methods include contacting the ferrous metal substrate with an aqueous pretreatment composition comprising: (a) a Group IIIB and/or IVB metal compound; (b) phosphate ions; and (c) water. 1. A method for coating a ferrous metal substrate , comprising: (i) a Group IIIB and/or IVB metal compound;', '(ii) phosphate ions; and', '(iii) water,', 'wherein the Group IIIB and/or IVB metal compound is present in the pretreatment composition in an amount of 10 to 500 ppm metal and the weight ratio of Group IIIB and/or IVB metal to phosphate ions in the pretreatment composition is at least 0.8:1; and', 'wherein the phosphate ions are maintained in a bath of the pretreatment composition in an amount:', '(i) sufficient to essentially prevent the formation of insoluble rust in the bath; and', {'sup': '2', '(ii) insufficient to prevent the deposition of a Group IIIB or IVB metal film having a coverage of at least 10 mg/mon the ferrous metal substrate;'}, '(iii) resulting in a weight ratio of phosphate to ferric ions of 1 to 1.7:1; and then, '(a) contacting the ferrous metal substrate with an aqueous pretreatment composition having a pH of 4 to 5.5 and comprising(b) contacting the substrate with a coating composition comprising a film-forming resin to form a coated metal substrate that exhibits corrosion resistance properties.2. The method of claim 1 , wherein the ferrous metal substrate comprises cold rolled steel.3. The method of claim 1 , wherein the pretreatment composition is brought into contact with the ferrous metal substrate by spraying.4. The method of claim 1 , wherein the IVB metal compound used in the pretreatment composition is a compound of zirconium.5. The method of claim 4 , wherein the compound of zirconium comprises hexafluorozirconic acid.6. The method of claim 1 , wherein the group IIIB and/or IVB metal compound ...

METHODS FOR TREATING A FERROUS METAL SUBSTRATE

Disclosed are methods for treating and coating a ferrous metal substrate, such as cold rolled steel, hot rolled steel, and electrogalvanized steel. These methods include contacting the ferrous metal substrate with an aqueous pretreatment composition comprising: (a) a Group IIIB and/or IVB metal compound; (b) phosphate ions; and (c) water. Also disclosed are off-shift methods of removing iron from the pretreatment bath. 1. A method for removing iron from a pretreatment bath containing a pretreatment composition comprising a Group IIIB and/or Group IV metal , comprising:(a) reducing the pH of the pretreatment bath by at least 0.2;(b) adding phosphate ions to the pretreatment bath in (a); and(c) raising the pH of the pretreatment bath in (b) by at least 0.2.2. The method of claim 1 , wherein the pH of the pretreatment bath is reduced by at least 1.0.3. The method of claim 1 , wherein the reducing comprises adding an acid to the pretreatment bath.4. The method of claim 3 , wherein the acid comprises a Group IVB flurometal acid claim 3 , phosphoric acid claim 3 , sulfuric acid claim 3 , sulfamic acid claim 3 , nitric acid claim 3 , and mixtures thereof.5. The method of claim 3 , wherein the acid comprises hexafluorozirconic acid.6. The method of claim 1 , wherein the source of phosphate ions comprises alkali metal orthophosphates claim 1 , ammonium orthophosphates claim 1 , and mixtures thereof.7. The method of claim 1 , wherein the source of phosphate ions comprises monosodium phosphate.8. The method of claim 1 , wherein the pretreatment bath in (c) is substantially free of iron.9. The method of claim 1 , further comprising adding an oxidizing agent to the pretreatment bath in (b).10. The method of claim 9 , wherein the oxidizing agent comprises peroxide compounds.11. The method of claim 1 , further comprising filtering the pretreatment bath in (c).12. The method of claim 1 , wherein the method is performed in the absence of an article to be coated by the pretreatment ...

METHOD FOR PREPARING AND TREATING A STEEL SUBSTRATE

Disclosed are methods for treating metal substrates, including ferrous substrates, such as cold rolled steel and electrogalvanized steel. The methods include contacting the metal substrates with a conditioning composition including a free fluoride source and then depositing a pretreatment composition including a Group IIIB and/or IVB metal on a portion of the substrate contacted with the conditioning composition. Also disclosed are electrophoretically coated substrates treated by the methods. 1. A method for preparing and pretreating a substrate comprising:(a) contacting at least a portion of the substrate with a conditioning composition comprising a free fluoride source; and(b) depositing a pretreatment composition comprising a Group IIIB and/or Group IVB metal on at least a portion of the substrate contacted with the conditioning composition.2. The method of claim 1 , wherein the conditioning composition is formulated to replenish the pretreatment composition.3. The method of claim 1 , wherein the conditioning composition is compatible with the pretreatment composition.4. The method of claim 1 , wherein the conditioning composition is substantially free of oxidants.5. The method of further comprising:(c) depositing a coating composition onto at least a portion of the substrate contacted with the pretreatment composition.6. The method of claim 1 , wherein the conditioning composition has a pH of below 7.7. The method of claim 1 , wherein the free fluoride of the conditioning composition comprises from 10 to 5000 parts per million claim 1 , based on a total weight of the conditioning composition.8. The method of claim 1 , wherein the free fluoride of the conditioning composition comprises from 100 to 2000 parts per million claim 1 , based on a total weight of the conditioning composition.9. The method of claim 1 , wherein the free fluoride source comprises hexafluorozirconic acid claim 1 , hexafluorotitanic acid claim 1 , salts thereof claim 1 , ammonium bifluoride ...

Method for preparing and treating a steel substrate

Disclosed are methods for treating metal substrates, including ferrous substrates, such as cold rolled steel and electrogalvanized steel. The methods include contacting the metal substrates with a conditioning composition including a free fluoride source and then depositing a pretreatment composition including a Group IIIB and/or IVB metal on a portion of the substrate contacted with the conditioning composition. Also disclosed are electrophoretically coated substrates treated by the methods.

Methods for treating a ferrous metal substrate

Disclosed are methods for treating and coating a ferrous metal substrate, such as cold rolled steel, hot rolled steel, and electrogalvanized steel. These methods include contacting the ferrous metal substrate with an aqueous pretreatment composition comprising: (a) a Group IIIB and/or IVB metal compound; (b) phosphate ions; and (c) water. Also disclosed are off-shift methods of removing iron from the pretreatment bath.

Methods for treating a ferrous metal substrate

Methods for treating a ferrous metal substrate

本發明揭示處理及塗佈鐵金屬基材(諸如冷軋鋼、熱軋鋼及電鍍鋅鋼)之方法。此等方法包括使該鐵金屬基材與包含以下之水性預處理組合物接觸：(a)IIIB及/或IVB族金屬化合物；(b)磷酸根離子；及(c)水。亦揭示自預處理浴移除鐵之離位方法。

Pretreatment compositions and methods of treating a substrate

Disclosed is a pretreatment composition containing (a) a Group IIIB metal, a Group IVB metal, or combinations thereof; and (b) a compound containing at least six phosphorus-containing acid groups or salts thereof; wherein the molar ratio of (a) to (b) is at least 3:1. Also disclosed are methods of treating a substrate with the pretreatment composition and substrates treated with the pretreatment composition.

Pretreatment compositions and methods of treating a substrate

Disclosed is a pretreatment composition containing (a) a Group IIIB metal, a Group IVB metal, or combinations thereof; and (b) a compound containing at least six phosphorus-containing acid groups or salts thereof; wherein the molar ratio of (a) to (b) is at least 3:1. Also disclosed are methods of treating a substrate with the pretreatment composition and substrates treated with the pretreatment composition.

Pretreatment compositions and methods of treating a substrate

Disclosed is a pretreatment composition containing (a) a Group IIIB metal, a Group IVB metal, or combinations thereof; and (b) a compound containing at least six phosphorus-containing acid groups or salts thereof; wherein the molar ratio of (a) to (b) is at least 3:1. Also disclosed are methods of treating a substrate with the pretreatment composition and substrates treated with the pretreatment composition.