GB/T 15519-2002 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 15519-2002 | English | 130 |
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Chemical conversion coatings -- Black oxide coating on iron and steel -- Specification and test methods
| Valid |
| GB/T 15519-1995 | English | 239 |
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The chemical oxide coating for iron and steel
| Obsolete |
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GB/T 15519-2002: Chemical conversion coatings -- Black oxide coating on iron and steel -- Specification and test methods
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT15519-2002
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.220.20
A 29
Replacing GB/T 15519-1995
Chemical conversion coatings - Black oxide coating
on iron and steel - Specification and test methods
(ISO 11408.1999, MOD)
Issued on. APRIL 16, 2002
Implemented on. DECEMBER 01, 2002
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Information that the purchaser shall provide to the supplier... 6
4.1 Necessary information... 6
4.2 Additional information... 6
5 Substrate... 7
6 Heat treatment of steel... 7
6.1 Overview... 7
6.2 Heat treatment before black oxidation... 7
6.3 Heat treatment after black oxidation... 7
7 Requirements... 8
7.1 Appearance and surface quality... 8
7.2 Oxalic acid resistance test... 8
7.3 Test of austenitic stainless steel’s resistance to neutral salt spray... 8
8 Sampling... 8
Appendix A (Informative) Treatment process of iron and steel... 10
Appendix B (Informative) Test methods of neutral surface reaction, porosity and
continuity... 11
Foreword
This standard adopts ISO 11408.1999 "Chemical conversion coatings - Black
oxide coating on iron and steel - Specification and test methods" (English
version).
This standard was redrafted in accordance with ISO 11408.1999 with the
following modifications.
- REFER to Chinese standards which adopt international standards;
- USE “this standard” to replace "this international standard";
- In Appendix A.1, ADD a typical treatment process for acidic (normal
temperature) oxidation of steel.
This standard replaces GB/T 15519-1995 "Chemical oxide film of steel iron".
Compared with GB/T 15519-1995, the main changes are as follows.
- MODIFY the content of heat treatment before and after oxidation of steel
(5.2 and 7.1 of the 1995 edition; Chapter 6 of this edition)
- MAKE no specific requirements for the color of the black oxide film (8.1 of
the 1995 edition; 7.1 of this edition);
- MODIFY the test method for porosity and continuity (8.3 of the 1995 edition;
Appendix B.2 of this edition);
- ADD additional information (see 4.2);
- ADD the content of oxalic acid resistance test (see 7.2.2);
- ADD the typical treatment process for black oxidation of steel (see Table
A.1);
- ADD the experimental methods for neutral surface reactions (see Appendix
B.1);
- DELETE the contents of packaging, transportation and storage (Chapter
10 of 1995 edition).
Appendix A and Appendix B of this standard are informative appendixes.
This standard was proposed by China Machinery Industry Federation.
This standard shall be under the jurisdiction of the National Technical
Committee for Standardization of Metal and Nonmetallic Coatings.
Responsible drafting organization of this standard. Wuhan Institute of Material
Protection.
Participated drafting organization of this standard. Changsha Institute of Military
and Civilian Products.
The main drafters of this standard. Zhang Dezhong, Chen Xiaofan, Cai Yuying,
Chen Yun, Chen Su.
This standard replaces the standards previously issued as follows.
- GB/T 15559-1995.
Chemical conversion coatings - Black oxide coating
on iron and steel - Specification and test methods
1 Scope
This standard specifies the requirements for black oxide films on iron and steel
(including cast iron, wrought iron, carbon steel, low alloy steel and stainless
steel). Black oxide film can be used to reduce friction between sliding surfaces
or bearing surfaces, or for decoration, or to reduce light reflection.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
3 Terms and definitions
The terms and definitions as defined in GB/T 12334 as well as the following
terms and definitions apply to this standard.
Certain coated or to-be-coated surfaces on a workpiece on which the coating
is critical to its performance and / or appearance; the coating on the surface
must meet all specified requirements.
4 Information that the purchaser shall provide to the supplier
When the purchaser requires the workpiece to be coated with a black oxide film
in accordance with this standard, it shall provide the following information to the
supplier.
5 Substrate
The surface roughness of the film depends on the original surface roughness
of the substrate, so it shall not be the cause of rejection of the black oxide film.
6 Heat treatment of steel
The heat treatment before black oxidation shall be performed in accordance
with ISO 9587.The heat treatment shall be performed before any pretreatment
or cleaning process using an aqueous solution is started.
Heat treatment after black oxidation shall be performed in accordance with ISO
9588.Surface-hardened workpieces shall be heat treated at 190 °C ~ 220 °C
for not less than 2 h.
7 Requirements
The film layer should be free of red oxidation spots; the entire film layer shall
not be reddish brown. Before any additional anticorrosive treatment is applied,
the portion wiped by a clean Whatman40 filter paper (or other filter paper of the
same quality) shall be free of reddish brown or green dirt.
8 Sampling
Samples shall be randomly selected from the inspection lot according to the
sample size as specified in GB/T 12609.Each sample shall be checked for
compliance with this standard; the lot shall be judged as meeting or not meeting
the requirements in accordance with the rules of the sampling plan in GB/T
11609.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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