Method for producing molded bodies from sheet steel galvanized on one or both sides

Patent metadata

Field	Value
Publication number	US-9228148-B2
Application number	US-200913133064-A
Country	US
Kind code	B2
Filing date	Nov 24, 2009
Priority date	Dec 4, 2008
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

A method of producing shaped articles made from single-sidedly or double-sidedly galvanized steel sheet, starting from galvanized steel strip, at least one of the steps of the method being a transport operation, and in which, for protection from black-spot corrosion, a corrosion preventive oil is applied which comprises at least one phosphoric acid polyoxyalkylene ester.

First claim

The invention claimed is:

1. A method comprising producing shaped articles made from galvanized steel by a process comprising—in order—:
(1) applying a corrosion preventive oil to a surface of a galvanized steel strip in an amount of 0.25 to 5 g/m 2 ,
(2) transporting the oiled, galvanized steel strip to a fabrication site for shaped articles, and
(3) separating and forming the oiled, galvanized steel strip into shaped articles,

wherein the corrosion preventive oil comprises 20 to 100% by weight, based on the total amount of all of the components of the corrosion preventive oil, of at least one phosphoric ester (A) of the general formula
[R 2 —(—O—CH(R 1 )—CH 2 —) n —O—] k —P(═O)—(OX) 3-k

and where R 1 , R 2 , X, n, and k have the following definitions:
k: 1 or 2,
n: a number from 10 to 70,
R 1 : independently at each occurrence a radical selected from the group consisting of H, C 1 to C 10 alkyl radicals or aryl-substituted C 2 to C 10 alkyl radicals, wherein for at least 50 mol % of the radicals R 1 is a methyl radical,
R 2 : H or a C 1 to C 30 alkyl radical,
X: H or a cation 1 /mY m+ , where m is a natural number from 1 to 3.

2. The method according to claim 1 , further comprising:
(4) transporting the shaped articles to a further fabrication site.

3. The method according to claim 2 , further comprising:
(5) joining the shaped articles to other shaped articles to form assembled shaped articles.

4. The method according to claim 1 , wherein the shaped articles produced in step (3) are parts of automobile bodies.

5. The method according to claim 3 , wherein the assembled shaped articles produced in step (5) are automobile bodies.

6. The method according to claim 1 , wherein, in step (3), the metal strip into individual sheets and cleaned and, prior to forming, a second corrosion preventive oil comprising 20 to 100% by weight, based on the total amount of all of the components of the corrosion preventive oil, of at least one phosphoric ester (A) of the general formula
[R 2 —(—O—CH(R 1 )—CH 2 —) n —O—] k —P(═O)—(OX) 3-k

is applied in an amount of 0.25 to 3 g/m 2 .

7. The method according to claim 1 , wherein the transport of step (2) is transport by truck or by rail.

8. The method according to claim 1 , wherein the corrosion preventive oil further comprises 20 to 80% by weight of at least one diluent (B).

9. The method according to claim 8 , wherein the at least one diluent comprises
R 3 —(—O—CH(CH 3 )—CH 2 —) m —O—R 3 , where R 3 independently of one another are H or a C 1 to C 4 alkyl radical and m is a number from 2 to 20.

10. The method according to claim 8 , wherein the at least one diluent comprises dipropylene glycol.

Assignees

• HüFFER STEPHAN
• Witteler Helmut
• Feβenbecker Achim
• Stellnberger Karl-Heinz
• Fleischanderl Martin
• Voestalpine Stahl Gmbh

Inventors

• HüFFER STEPHAN
• Witteler Helmut
• Feβenbecker Achim
• Stellnberger Karl-Heinz
• Fleischanderl Martin

Classifications

• C10N2030/12

  Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives · CPC title

• C10N2040/247

  Stainless steel · CPC title

• C10N2040/20

  Metal working · CPC title

• Y10T428/12556

  Organic component · CPC title

• C10M2223/043

  Ammonium or amine salts thereof · CPC title