# US 8,784,981 B2 · Stainless steel-and-resin composite and method for making same

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- Number: US 8,784,981 B2
- Document ID: US8784981B2
- Status: Granted
- Kind: B2
- Application number: 13/282,235
- Filed: 2011-10-26
- Published: 2012-09-20
- Granted: 2014-07-22
- Earliest claimed: 2011-03-14
- Assignees: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD.; Hon Hai Precision Industry Co., Ltd.
- Applicants: Hsin-Pei Chang; Wen-Rong Chen; Huann-Wu Chiang; Cheng-Shi Chen; Dai-Yu Sun; Yuan-Yuan Feng; Yu-Qiang Wang
- Inventors: Hsin-Pei Chang; Wen-Rong Chen; Huann-Wu Chiang; Cheng-Shi Chen; Dai-Yu Sun; Yuan-Yuan Feng; Yu-Qiang Wang
- Web page: https://patentgrep.com/patent/US8784981B2

## CPC

- B29C 45/14311: {using means for bonding the coating to the articles (B29C45/14795 takes precedence)}
- B29C 2045/14803: {the injected material entering minute pores}
- B29C 2045/14868: {Pretreatment of the insert, e.g. etching, cleaning}
- B29K 2705/12: Iron
- Y10T 428/249955: Void-containing component partially impregnated with adjacent component
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A stainless steel-and-resin composite includes a stainless steel part and a resin part bonded to the stainless steel part. The stainless steel part has a porous film resulted from anodizing formed thereon. The porous film defines pores with an average diameter of about 100 nm-500 nm. The resin part is integrally bonded to the surface of the stainless steel part having the porous film, with portions of the resin part penetrating in the pores. The resin part mainly comprises crystalline thermoplastic synthetic resin.

## Claims

### Claim 1

A stainless steel-and-resin composite, comprising:
a stainless steel part having a porous film formed on and in direct contact with a surface thereof, wherein the porous film is an anodic oxide film resulting from anodizing the stainless steel part, the porous film having pores with an average diameter of about 100 nm-500 nm, the porous film substantially comprising elements Fe, Cr, Ni, O, Cl and N, the elements Fe, Cr, Ni, O, Cl and N exiting mainly as compounds comprising iron oxide, nickel oxide, chromium chloride, and nickel chloride; and
a resin part integrally bonded to the surface of the stainless steel part having the porous film, with portions of the resin part penetrating in the pores, the resin part mainly comprising crystalline thermoplastic synthetic resin.

### Claim 2 (depends on 1)

The composite as claimed in claim 1, wherein the porous film has an arithmetical mean surface roughness Ra of about 0.2 μm to about 1.0 μm, a ten-point mean roughness Rz of about 2.5 μm to about 5.0 μm, and a mean width of profile elements Rsm of about 30 μm to about 50 μm.

### Claim 3 (depends on 1)

The composite as claimed in claim 1, wherein the crystalline thermoplastic synthetic resin is selected form one of the group consisting of polyphenylene sulfide, polyamide, and polyethylene terephthalate.

### Claim 4 (depends on 3)

The composite as claimed in claim 3, wherein the crystalline thermoplastic synthetic resin is polyphenylene sulfide added with glass fiber as an auxiliary ingredient at a weight percentage of about 25%-35%.