Electroceramic coatings for magnesium alloys

A magnesium metal and coating technology, applied in the field of electric porcelain coatings for magnesium alloys, can solve the problems of reduced corrosion resistance, changes in coating uniformity, etc.

Inactive Publication Date: 2019-07-12
HENKEL KGAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many of these variables are outside of the product manufacturer's control and lead to variations in coating uniformity and reduced corrosion resistance

Method used

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  • Electroceramic coatings for magnesium alloys
  • Electroceramic coatings for magnesium alloys
  • Electroceramic coatings for magnesium alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Example 1: Inorganic-Based Coatings with Post-Treatment and Without Paint

[0102] AZ-31 magnesium alloy panels were immersed in an electrolytic bath containing 40 g / L KF and 5 g / L KOH. Using square wave electrolysis with 25 milliseconds on and 9 milliseconds off as the anode for about 180 seconds produced an edge-covered inorganic-based coating. The coated panels were removed from the bath and rinsed with deionized water for 300 seconds. The coating was observed to have a uniform surface appearance and a thickness of 4 microns. The electrodeposited inorganic-based coating was not dried. Thereafter, each coated panel was dipped into an aqueous aftertreatment comprising one of the compositions listed in Table 1. The coated panels were subjected to a dipping time of 3 minutes in the post-treatment tank.

[0103] The coated and post-treated panels were rinsed with deionized water and dried. The panels were then subjected to a salt spray test according to ASTM B-117 ...

Embodiment 2

[0108] Example 2: Inorganic-Based Coatings with Post-Treatment and Without Paint

[0109] A new set of samples processed according to the procedure of Example 1 was prepared using a different magnesium alloy (AZ-91 ) test panel with a higher impurity level. Some samples were post-treated using a second commercially available post-treatment agent instead of SAVAN. All panels were tested according to the procedure of Example 1, and the test results are shown in Table 2.

[0110] Table 2. Post-treatment studies of unpainted salt spray tests on AZ-91 alloy

[0111]

[0112] In the above tests, "pass" means that no significant pitting was observed on the panel.

[0113] Comparing the salt spray resistance of the control water-rinsed panels of Table 1 and Table 2 shows that magnesium alloys with lower amounts of Mg and / or larger amounts of alloy metals and impurities (at 24 hours) are more effective than magnesium alloys with higher Mg metal concentrations. Alloy (168 hours)...

Embodiment 3

[0114] Example 3: Pretreatment Comparison of Paint Corrosion Performance

[0115] AZ-31 magnesium alloy panels are treated as described in the table below. All panels had bare 6061 aluminum skins bonded to the test panels with Terocal 5089 adhesive commercially available from Henkel Corp. Different metals are used to establish electrochemical reactions in the samples. Panels are scored through paint and primer coats to metal surfaces, then subjected to a 504-hour salt spray test per ASTM B-117. The results are shown in Table 3.

[0116] Table 3. AZ-31 alloy without post-treatment, painted salt spray test (ASTM B-117)

[0117]

[0118] Conversion Coat 1 is a commercially available chromium-free conversion coating formulated to treat non-ferrous alloys at coat weights commonly used for these products. Electroceramic coatings are electrolytically applied inorganic-based coatings according to the invention having an amorphous bilayer structure. Coatings were commercially...

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Abstract

The present invention relates to articles having a magnesium-containing metal surface to which an electroceramic coating is chemically bonded, and to articles having a composite coating wherein the composite coating comprises a first portion of an electroceramic coating and comprises a The second part of the organic and / or inorganic component of the electroceramic coating. The invention also relates to methods of making and using the articles.

Description

technical field [0001] The present invention relates to articles having a magnesium-containing metal surface, wherein an electroceramic coating is chemically bonded to the metal surface, and to articles having a composite coating, wherein the composite coating comprises a first portion of an electroceramic coating and comprises a material other than an electroceramic coating. The second part of the organic and / or inorganic component of the layer. The invention also relates to methods of making and using the articles. Background technique [0002] Light weight of magnesium and magnesium alloy (~1.74gm / cm 3 density) and strength make products made from it ideal for use in the manufacture of components such as electronic devices, including handheld electronic devices; motor vehicles; aircraft and other products requiring low density. [0003] One of the most significant disadvantages of magnesium and magnesium alloys is their susceptibility to corrosion. Exposure to oxygen, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30
CPCC25D11/024C25D11/026C25D11/30C25D11/022
Inventor S·E·多兰K·克拉默M·A·小曼菲L·K·萨莱
Owner HENKEL KGAA
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