GB/T 3903.19-2008 English PDF (GB/T3903.19-2008)

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GB/T 3903.19-2008: Footwear -- Test methods for accessories: Metallic accessories -- Corrosion resistance
GB/T 3903.19-2008
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 61.060
Y 78
GB/T 3903.19-2008 / ISO 22775.2004
Footwear - Test methods for accessories.
Metallic accessories - Corrosion resistance
(ISO 22775.2004, IDT)
ISSUED ON. JUNE 18, 2008
IMPLEMENTED ON. MAY 1, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Terms and definitions ... 4 
3 Principle... 4 
4 Apparatus, materials and reagents ... 5 
5 Test specimen ... 5 
6 Conditioning ... 6 
7 Procedure ... 6 
8 Calculation and expression of results ... 8 
9 Test report ... 8 
Foreword
This Part of GB/T 3903 identically adopts the International Standard ISO
22775.2004 Footwear - Test methods for accessories. Metallic accessories -
Corrosion resistance (English version). They are exactly identical in technical
content. This Part of GB/T 3903 only makes the following editorial modifications.
a) modified “this European Standard” to “this Part of GB/T 3903” (Translator
Note. Original text in Chinese is European Standard);
b) deleted the foreword of ISO 22775.2004;
c) deleted the table of contents of ISO 22775.2004;
d) modified the density unit from “g/dm3” to “g/L”.
This Part was proposed by China Light Industry Association.
This Part shall be under the jurisdiction of National Technical Committee on
Footwear of Standardization Administration of China.
The drafting organizations of this Part. China Institute of Leather and Footwear
Industry, Cornell Group Limited.
Main drafters of this Part. Zhang Weijuan, Dai Jinqing.
Footwear - Test methods for accessories.
Metallic accessories - Corrosion resistance
Warning. the user of this Part of GB/T 3903 should have practical
experience in regular laboratory. This Part does not point out all the
possible safety problems. The user shall have responsibility to take
appropriate safety and healthy measures, in accordance with relevant
regulations.
1 Scope
This Part of GB/T 3903 specifies two methods for determining the propensity of
a metal surface to either change visually due to contamination by atmospheric
pollution (Method 1. sulphide tarnishing ), or to corrode due to the action of salt
water (Method 2. salt water corrosion).
This Part is applicable to metallic accessories of footwear irrespective of the
kind.
2 Terms and definitions
For the purposes of this Part of GB/T 3903, the following term and definition
applies.
2.1 corrosion resistance
propensity of a metal surface either not to change visually due to chemical
attack by atmospheric pollution, or not to be altered due to the action of salt
water
3 Principle
3.1 Method 1
A test specimen is stored in a moist atmosphere containing a low concentration
of hydrogen sulphide gas for 1 h. The specimen is then assessed subjectively
for signs of discoloration.
3.2 Method 2
Cotton lawn, saturated with sodium chloride solution, is wrapped around a test