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Two-step zinc phosphating process

a zinc phosphate and zinc phosphate technology, applied in the direction of electrolytic coatings, metal material coating processes, coatings, etc., can solve the problems of 0.5 to 5 grams of aluminum being etched off of the substrate, poor appearance of subsequently applied coating layers, etc., to promote good corrosion resistance performance

Inactive Publication Date: 2013-09-05
PPG IND OHIO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides methods for treating multi-metal assemblies, such as those containing aluminum and non-aluminum metals, with a zinc-phosphate composition and a second source of fluoride ions. These methods result in improved corrosion resistance and adhesion between the different metals, leading to improved performance of the assembly. In addition, related treated substrates are also provided.

Problems solved by technology

One disadvantage with the conventional phosphating of multi-metal substrates, however, is that for every square meter of aluminum processed, 0.5 to 5 grams of aluminum is etched off of the substrate.
In addition, as aluminum content increases, downstream filtration systems can be overwhelmed, resulting in dusty / gritty layers of horizontal surfaces which translate into poor appearance of subsequently applied coating layers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0084]The following examples illustrate exemplary embodiments of the invention. However, the examples are provided for illustrative purposes only, and do not limit the scope of the invention. Unless otherwise indicated, all parts and percentages in the following examples, as well as throughout the specification, are by weight.

examples 1-6

ip Resistance

Example 1

[0085]The following solutions were used in Example 1.

[0086]Solution A: A spray cleaner bath was prepared by adding water to a spray tank with V-jet nozzles that spray at a pressure of 15 psi located 8″ from the panel surface. 1.325 liter of Chemkleen 2010LP base cleaner (available from PPG Industries, Inc.) was placed into a 35 gallon reservoir of tap water and 132.5 milliliter of Chemkleen CK181ALP (available from PPG Industries, Inc.) was also placed into the cleaning tank. The solution was circulated and heated to the reported temperature in the table below.

[0087]Solution B: An immersion cleaner bath was made by adding water to a 20 gallon immersion tank with a circulating heater (Julaba brand). The heater / stirrer was the only form of recirculation in the bath. 757 ml of Chemkleen 2010LP base cleaner (available from PPG Industries, Inc.) was placed into a 20 gallon reservoir of tap water and 75 ml of Chemkleen CK181ALP (available from PPG Industries, Inc.) w...

example 2

[0096]A set of Aluminum alloy 6111, electro-galvanized steel, hot-dipped galvanized steel and cold-rolled steel panels was processed using the sequence set forth in Table 2, except that Solution G was omitted.

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Abstract

Described are methods for treating a multi-metal assembly. The assembly has a first portion that includes an aluminum substrate and a second portion that includes a non-aluminum metal substrate. The methods include treating the multi-metal assembly by contacting the assembly with a zinc-phosphate composition and contacting the treated assembly with a composition that includes a Group IIIB and / or IVB metal and free fluoride.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61 / 530,519, filed Sep. 2, 2011, which is incorporated by reference herein in its entirety.FIELD[0002]The present invention relates to methods for treating a multi-metal assembly comprising a first portion comprising an aluminum substrate and a second portion comprising a non-aluminum metal substrate.BACKGROUND[0003]For a variety of reasons, such as a desire to improve fuel economy, some automobile manufacturers are using increasing amounts of aluminum in the construction of their vehicles. As a result, multi-metal assemblies that include a greater amount of aluminum substrate in combination with non-aluminum, such as steel, substrates, may become more common.[0004]Pretreating metal substrates, including aluminum and steel substrates, with phosphate conversion coatings has been conventional for promoting corrosion resistance. One disadvantage with the conven...

Claims

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Application Information

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IPC IPC(8): C23F11/00
CPCC23C22/362C23C22/365C23F11/00C23C22/83C25D13/20C23C22/73
Inventor DECHANT, JAMES A.PREMO, RICHARDSIMPSON, MARK
Owner PPG IND OHIO INC