GB/T 5003-2023Test method for measuring to the chemical corroding resistance of glazes of domestic ceramics (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.

This document replaces GB/T 5003-1999 "Determination of Chemical Corrosion Resistance of Glazed Ceramics for Daily Use", and is consistent with GB/T 5003-1999 In addition to structural adjustments and editorial changes, the main technical changes are as follows:

a) The scope of application of the standard has been changed (see Chapter 1, Chapter 1 of the 1999 edition);

b) Changed the terms and definitions (see Chapter 3, Chapter 2 of the 1999 edition);

c) Added principles (see Chapter 4);

d) Changes to reagents or materials (see Chapter 5, Chapter 3 of the 1999 edition);

e) Changed the equipment (see Chapter 6, Chapter 4 of the 1999 edition);

f) Changed the sample requirements (see Chapter 7, Chapter 5 of the 1999 edition);

g) Added technical requirements for water (see 5.1);

h) The test procedure at room temperature has been changed (see 8.1, Chapter 6 of the 1999 edition);

i) Added technical requirements for spectrophotometer (see 6.1);

j) The technical requirements for ceramic standard whiteboards have been added (see 6.2);

k) Added heating test steps (see 8.2);

l) Increased test data processing (see Chapter 9);

m) Changed the performance evaluation (see Chapter 10, Chapter 7 of the 1999 edition);

n) The test report has been changed (see Chapter 11, Chapter 8 of the 1999 edition).

1 Scope

This document describes the method and method for the determination of the chemical corrosion resistance of glazed ceramics for daily use characterized by color difference deltaEab* at room temperature and under heating conditions. performance evaluation.

This document is applicable to the determination of the chemical corrosion resistance of glazed surfaces of household ceramics.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 3979 Measurement method of object color

GB/T 5000 Terminology of Ceramics for Daily Use

GB/T 5698 Color Terminology

GB/T 6682 Analytical laboratory water specifications and test methods

GB/T 9086 Standard whiteboard for colorimetric and photometric measurement

3 Terms and Definitions

The terms and definitions defined in GB/T 5000 and GB/T 5698 apply to this document.

4 Principles

Under different temperature conditions, after a certain period of time, the glazed surface of daily-use ceramic samples will be corroded by chemical test solution, and the color will change to varying degrees.

The color difference of the glaze surface before and after the corrosion of the sample is measured by an instrument; and the color difference within the corrosion cycle is measured according to the internationally recognized color difference judgment criteria.

The maximum value of the glaze color difference deltaEab(max) is evaluated to obtain the grade of the chemical corrosion resistance of the glazed surface of the test sample.

5 Reagents or Materials

Unless otherwise specified, use only analytical grade reagents and above.

5.1 Water, GB/T 6682, Class III.

5.2 Citric acid solution, 100g/L.

5.3 Hydrochloric acid solution, 20% (mass fraction).