# US 2020/0399762 A1 · Aluminum alloy fastening member and method for producing aluminum alloy fastening member

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- Number: US 2020/0399762 A1
- Document ID: US20200399762A1
- Status: Published application
- Kind: A1
- Application number: 16/843,738
- Filed: 2020-04-08
- Published: 2020-12-24
- Earliest claimed: 2019-06-21
- Assignees: YKK Corporation
- Applicants: Ykk Corporation
- Inventors: Yuki URITA; Atsushi OGIHARA; Shigeru TSUCHIDA; Chikako HIROMI; Ryota ARA; Sohei NAGASAWA; Mitsuomi KATORI; Misako HOSAKA
- Web page: https://patentgrep.com/patent/US20200399762A1

## CPC

- C23C 22/66: Treatment of aluminium or alloys based thereon
- A44B 19/06: with substantially rectangular members having interlocking projections and pieces
- C22C 21/02: with silicon as the next major constituent
- C22C 21/06: with magnesium as the next major constituent
- C22C 21/08: with silicon
- C23C 22/56: Treatment of aluminium or alloys based thereon
- C23C 22/73: characterised by the process
- A44B 19/36: Means for permanently uniting the stringers at the end; Means for stopping movement of slider at the end
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- A44B: BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE (fastenings specially adapted for footwear A43C)
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

Provided is an aluminum alloy fastening member including a chemical conversion coating having a novel composition as a colored coating, and a method for producing the aluminum alloy fastening member. The aluminum alloy fastening member includes a chemical conversion coating containing tellurium as a component element.

## Claims

### Claim 1

An aluminum alloy fastening member comprising a chemical conversion coating, the chemical conversion coating containing tellurium as a component element.

### Claim 2 (depends on 1)

The aluminum alloy fastening member according to claim 1, wherein the chemical conversion coating of the aluminum alloy fastening member satisfies color tone ranges of −5≤a*≤10; −3≤b*≤18; and 0≤L*≤75, in a CIELAB color space as defined in JIS Z 8781-4 (2013).

### Claim 3 (depends on 2)

The aluminum alloy fastening member according to claim 2, wherein the chemical conversion coating of the aluminum alloy fastening member further presents a gray color that satisfies color tone ranges of −5≤a*≤8; −3≤b*≤10; and 40≤L*≤75, in a CIELAB color space as defined in JIS Z 8781-4 (2013).

### Claim 4 (depends on 1)

The aluminum alloy fastening member according to claim 1, wherein the chemical conversion coating has an average thickness of from 0.01 to 1.00 μm.

### Claim 5 (depends on 1)

The aluminum alloy fastening member according to claim 1, wherein the chemical conversion coating comprises 10% by mass or more of tellurium and/or a tellurium compound.

### Claim 6 (depends on 1)

The aluminum alloy fastening member according to claim 1, wherein the aluminum alloy has a composition represented by a general formula: AlaSibMgc, with each of a, b, c being % by mass; the symbol a being the balance; 0.1≤b≤1.5; 0.2≤c≤5.6; and which may contain unavoidable impurities.

### Claim 7 (depends on 1)

The aluminum alloy fastening member according to claim 1, wherein the aluminum alloy fastening member is an element for slide fasteners, a slider for slide fasteners, a stopper for slide fasteners, or a button.

### Claim 8 (depends on 1)

A method for producing the aluminum alloy fastening member according to claim 1, comprising a step of forming a chemical conversion coating containing tellurium as a component element by immersing an aluminum alloy fastening member in a metal surface treatment solution containing tellurium or a tellurium compound or a salt thereof.

### Claim 9 (depends on 8)

The method according to claim 8, wherein the tellurium or the tellurium compound or the salt thereof is tellurium monoxide, tellurium dioxide, tellurium trioxide, tellurous acid, telluric acid, tellurium tetrachloride, dimethyl telluride, or a salt thereof, or a combination thereof.