Multilayer coating

• US 10,577,693 B2
• Filed: 04/29/2016
• Issued: 03/03/2020
• Est. Priority Date: 04/30/2015
• Status: Active Grant

• Current Assignee: Liebherr-Aerospace Lindenberg GmbH (Liebherr-International AG)
• Original Assignee: Liebherr-Aerospace Lindenberg GmbH (Liebherr-International AG)
• Inventors: Waibel, Christof, Kroger, Benjamin
• Primary Examiner(s): Brooks, Kregg T
• Application Number:
  US15/141,958
• Publication Number:
  US 20160319435A1
• Time in Patent Office: 1,404 Days
• CPC Class Codes: B05D 2202/10 based on Fe
• CPC Class Codes: B05D 2350/65 metal layer
• CPC Class Codes: B05D 3/0254 After-treatment
• CPC Class Codes: B05D 5/067 Metallic effect
• CPC Class Codes: B05D 7/14 to metal, e.g. car bodies involving a chemical reaction between the metal and the coating C23
• CPC Class Codes: B32B 15/015 the said other metal being copper or nickel or an alloy thereof
• CPC Class Codes: C09D 5/08 Anti-corrosive paints
• CPC Class Codes: C09D 5/103 containing Al
• CPC Class Codes: C09D 5/106 containing Zn
• CPC Class Codes: C21D 6/00 Heat treatment of ferrous alloys
• CPC Class Codes: C21D 7/06 by shot-peening or the like
• CPC Class Codes: C21D 9/0068 for particular articles not mentioned below
• CPC Class Codes: C23C 22/24 containing hexavalent chromium compounds
• CPC Class Codes: C23C 22/50 Treatment of iron or alloys based thereon
• CPC Class Codes: C23C 22/73 characterised by the process
• CPC Class Codes: C23C 22/74 for obtaining burned-in conversion coatings
• CPC Class Codes: C23C 22/78 Pretreatment of the material to be coated
• CPC Class Codes: C23C 22/82 After-treatment
• CPC Class Codes: C23C 26/00 Coating not provided for in groups C23C2/00 - C23C24/00
• CPC Class Codes: C23C 28/00 Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
• CPC Class Codes: C23C 28/321 : with at least one metal alloy layer
• CPC Class Codes: C23C 28/34 : including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates

Abstract

A multilayer coating obtained by carrying out the steps of (1) applying a ZnNi layer to a substrate material, in particular to a steel; (2) carrying out a first heat treatment in a temperature range from 135-300° C., preferably from 185-220° C., for a time period of at least 4 hours, preferentially of at least 23 hours; (3) applying a metal-pigmented top coat to the ZnNi layer; and (4) carrying out a second heat treatment in a temperature range from 150-250° C., preferably from 180-200° C., for a time period of at least 10 minutes, prefer-ably of at least 20 minutes, preferentially of at least 30 minutes.

Claims

1. A method of manufacturing an aircraft component with a multilayer coating, the method comprising:

(1) applying a low hydrogen embrittlement ZnNi layer directly to a substrate material, wherein the substrate material is steel;

(2) carrying out a first heat treatment in a temperature range from 135-300°

C. for a time period of at least 23 hours;

(3) passivating the low hydrogen embrittlement ZnNi layer;

(4) applying a metal-pigmented top coat to the low hydrogen embrittlement ZnNi layer, wherein the top coat comprises a mixture of zinc flake layers and aluminum flake layers which are connected by an inorganic matrix; and

(5) carrying out a second heat treatment in a temperature range of between 180 and 200°

C. for a time period of at least 10 minutes.

2. The method in accordance with claim 1, wherein the first heat treatment temperature range is from 185-220°

C.

3. The method in accordance with claim 1, wherein the substrate material is shot peened with an intensity of at most 0.1 mm Almen A before step (1).