GB/T 9989.3: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 9989.3-2025 | English | RFQ |
ASK
|
3 days [Need to translate]
|
Vitreous and porcelain enamels - Determination of resistance to chemical corrosion - Part 3: Determination of resistance to chemical corrosion by alkaline liquids using a hexagonal vessel or a tetragonal glass bottle
| Valid |
GB/T 9989.3-2025
|
| GB/T 9989.3-2015 | English | 294 |
Add to Cart
|
3 days [Need to translate]
|
Vitreous and porcelain enamels -- Determination of resistance to chemical corrosion -- Part 3: Determination of resistance to chemical corrosion by alkaline liquids using a hexagonal vessel
| Valid |
GB/T 9989.3-2015
|
Basic data | Standard ID | GB/T 9989.3-2025 (GB/T9989.3-2025) | | Description (Translated English) | Vitreous and porcelain enamels - Determination of resistance to chemical corrosion - Part 3: Determination of resistance to chemical corrosion by alkaline liquids using a hexagonal vessel or a tetragonal glass bottle | | Sector / Industry | National Standard (Recommended) | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 9989.3-2015 | GB/T 9989.3-2015: Vitreous and porcelain enamels -- Determination of resistance to chemical corrosion -- Part 3: Determination of resistance to chemical corrosion by alkaline liquids using a hexagonal vessel
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Determination of resistance to chemical erosion of enamel - Part 3. Determination of the alkali solution hexagonal container erosion)
ICS 25.220.50
Y26
National Standards of People's Republic of China
Determination of enamel resistant to chemical attack
Part 3. Hexagonal container
Determination of alkali solution erosion
resistancetochemicalcorrosion-Part 3. Determinationofresistanceto
(ISO 28706-3.2008, IDT)
Issued on. 2015-10-09
2016-05-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Preface Ⅰ
Introduction Ⅱ
1 Scope 1
2 Normative references 1
3 Principle 1
4 Reagent 1
5 devices and materials 2
6 Sample 6
7 Step 6
The results are shown 7 8
9 7 Test standard detergent solution
Other conditions of the test solution and 10 8
Foreword
GB/T 9989 "Determination of enamel resistant to chemical attack" standard is divided into five parts.
--- Part 1. Determination of acid erosion at room temperature;
--- Part 2. resistant to boiling acids, boiling neutral liquids and vapors Determination of chemical attack;
--- Part 3. Hexagonal alkali solution container was measured erosion;
--- Part 4. a cylindrical container with a solution of alkali was measured erosion;
--- Part 5. Determination of resistance to chemical attack in a closed system.
This part of GB/T 9989 Part 3.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This part identical with ISO 28706-3.2008 "Determination of enamel resistant to chemical attack - Part 3. Hexagonal container alkali solution
Determination of liquid erosion "(in English).
Consistency correspondence between this part of international documents and normative references of our files are as follows.
--- GB/T 6031-1998 Determination of vulcanized rubber or thermoplastic rubber hardness (10 ~ 100IRHD) (ISO 48.1994,
IDT);
Laboratory use specifications and test methods (. 1987, MOD ISO 3696) --- GB/T 6682-2008 analysis.
Please note that some of the content of this document may involve patents. Release mechanism of the present document does not assume responsibility for the identification of these patents.
This part is proposed by the China National Light Industry Council.
This part of the National food in direct contact with materials and products Standardization Technical Committee (SAC/TC397) centralized.
This section is drafted. Donghua University, the National Optical glass enamels Quality Supervision and Inspection Center.
The main drafters of this section. Dai Qi, Sang Yi, Zhang Guoxiu, Xu Xiaojian.
Introduction
Aqueous solution of enamel and enamel erosion is a process of dissolution. Enamel main component is silica, it forms a three-dimensional silica
Salt network, formed by the hydrolysis of silicic acid or silicates, silicic acid or silicates dissolve these to erode medium. Other components (mainly gold
Metal oxide) will be hydrolyzed to form the corresponding metal hydroxide or hydroxide ions. All the products are eroded more or less to dissolve
Aggressive medium, the whole process will lead to erosion of material per unit area of \u200b\u200bweightlessness.
Some erosion and water erosion of the enamel surface was linear with time; there are also some erosion of the enamel surface water
Erosion time logarithmic relationship. Only water erosion linear relationship, you can use the scientific method to accurately calculate the weight loss per unit area
Rate [g/(m2 · h)], and the erosion rate (mm/a).
Effect of water on the surface of enamel erosion is the most important factor enamel mass, temperature and pH. Limited solubility of silica
Also played a certain extent. Here are erosion under different conditions in different types of enamel erosion.
a) at a temperature of 80 ℃, similar to 0.1mol/L sodium hydroxide alkaline solution (see GB/T 9989.4, Chapter 9), enamel
Silicate network by a greater erosion, silicates and most other components are dissolved in an alkaline hydrolysis solution, the amount of erosion
And the test time is linear, and therefore, the test results can be (per unit area and per unit of time with weight loss rate per unit area of
Weightlessness) and erosion rate (mm/a) to represent.
b) at room temperature, similar to the citric acidic solution (see GB/T 9989.1, Chapter 9) or similar strong sulfuric acid solution
Liquid (see GB T 9989.1, Chapter/Section 10), enamel silicate network by the small erosion in the enamel deposited on the surface in addition to two
Other than the silicon oxide component is limited. After high acid test by enamel, the enamel surface was not observed significant changes. and
After the acid test by poor enamel, the enamel surface will produce signs of erosion or rendered rough.
c) boiling in an acidic solution (see GB/T 9989.2), enamel silicate network eroded, silica and other enamel
Components are dissolved into the solution, but lower the solubility of silica in the acidic solution. Erosion solution will be dissolved dioxide
Silicon quickly saturated, there is deposited only on the enamel surface. Acid erosion will be inhibited, significantly decreased the rate of erosion.
Note. The test apparatus under glass in an acid attack will release silicate, also play a role in suppressing erosion.
In the gas phase experiments, the condensate formed in the surface of the sample does not contain any dissolved components of the enamel, effectively preventing such corrosion inhibition
Role.
The following are examples of non-linear enamel erosion and linear erosion.
1) boiling citric acid (see GB/T 9989.2, Chapter 10) and 30% boiling sulfuric acid (see GB/T 9989.2, Chapter 11)
Since the gas phase containing only trace amounts of acid, usually only test phase. Inhibitory Effect of acid erosion, and
And the amount of erosion depends on the time trial, so the test results with weight loss per unit area is represented; it can not be calculated
Weight loss rate per unit area.
Boiling hydrochloric acid (see GB/T 9989.2, Chapter 122) 20%)
Since this is an azeotropic boiling acid concentration in the liquid phase and gas phase are the same, so no liquid phase test
Experience. Intense boiling provides no inhibitory aggregates, the amount of time and erosion test is linear, because
Here, the test results for the weight loss rate per unit area (weight loss per unit area and per unit time) and the erosion rate
(Mm/a) to represent.
d) test liquid (see GB/T 9989.5) at high temperature and pressure conditions, the acidic solution is severe erosion. To avoid production
Health inhibition test time is limited to 24h, the higher the rate of acid erosion of enamel surface (simulation in a chemical reaction vessel
In addition, under these conditions the test conditions), with only a low silicon content of the aqueous test solution was prepared, and erosion test
Room was a linear relationship. Thus, 20% hydrochloric acid (see GB/T 9989.5, Chapter 8), simulation test solution (see
GB/T 9989.5, Chapter 10) or process fluid (see GB/T 9989.5, Chapter 11) The test results can follow the unit area
The weight loss rate (weight loss per unit area and per unit time) to represent.
e) in boiling water (see GB/T 9989.2, Chapter 13), the silicate network is very stable. Enamel surface to penetrate the main
Lord, the amount of dissolved silica is very limited. Such erosion can be represented by a gas attack, in the liquid phase for high corrosion resistance
Enamel, anti-erosion ability. But if the enamel chemical stability tests are relatively poor, the enamel surface will have an alkali metal ion
Precipitation, thereby increasing the pH value of the solution, increases the erosion of the liquid, so that liquid and vapor are able to get useful
information.
f) due to erosion may be linear or non-linear, the test results for weight loss per unit area is represented, and the test should be given
time.
g) For the standard detergent solution Test time 24h or 168h (see GB/T 9989.3, Chapter 9) test, because you can not really
Whether a given erosion curve is linear, so can not be included in the test report erosion rate calculations.
h) For other acidic solution (see GB/T 9989.2, Chapter 14) and an alkaline solution (see GB/T 9989.3, Chapter 10
GB T 9989.4, Chapter/Section 10), because during the test did not know whether the erosion rate is linear, so in this standard
The test report can not contain the erosion rate calculations.
For the firing temperature is lower than 700 ℃ enamel material, GB/T 9989 test parameters (medium, temperature and time) is not appropriate for
In this type of enamel (such as aluminum enamel) should use other media, temperature, and (or) time. These tests can be based on GB/T 9989 Part 1,
Part 2, Part 3 program and "other test solution" Part 4 to be described.
Determination of enamel resistant to chemical attack
Part 3. Hexagonal container
Determination of alkali solution erosion
1 Scope
This section GB/T 9989 sets out at 25 ℃ ~ 95 ℃ test temperature, using a hexagonal vessel, measuring enamelware alkali solution
Standard Test Method for erosion, the test device can simultaneously six enamel samples for testing.
Note 1. This test method can test any sample chemical stability alkaline solution. This test method was originally used to test the resistance of textiles during the washing process
Neutral heat and chemical stability of alkaline detergent.
Note 2. Since the detergent composition is always changing, given the current composition of the typical detergent market, the standard test solution in alkalinity, invasive and complex
Performance and other aspects of the regulations. Standard test solution pH and alkalinity depends on the proportion of sodium tripolyphosphate, sodium carbonate and sodium borate; three
Sodium also acts as a complexing agent. Standard test solution by adding the wettability of alkyl sulfonates can be obtained, due to the enamel surface by
Little effect on oxidation, there is no need to consider too much sodium borate, sodium perborate and increase the standard test solution does not make the obvious change of alkalinity
change. Other standard test solution and test solution (containing 5% sodium sulfate solution) is adapted to measure the heat the detergent solution on the enamel of different
Chemical stability tests.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
ISO 48 Determination of vulcanized rubber or thermoplastic rubber hardness [hardness between 10IRHD and 100IRHD) (Rubber,
vulcanizedorthermoplastic-Determinationofhardness (hardnessbetween10IRHDand100IRHD)]
ISO 3696 for analytical laboratory use specifications and test methods (Waterforanalyticallaboratoryuse-Specification
andtestmethods)
ISO 28764 enamel and enamel sheet steel, sheet aluminum and cast iron samples prepared enamel (Vitreousandporcelainen-
amels-Productionofspecimensfortestingenamelsonsheetsteel, sheetaluminiumandcastiron)
Principle 3
At a predetermined temperature and time, the six similar enamel samples were simultaneously exposed to corrosion tests in an alkaline solution, and then
After determination of the weight loss, weight loss and calculate the rate per unit area. During the test, the test solution was continuously stirred.
Is cold to the actual conditions of the washing machine, corresponding to the test during stirring constantly test solution, the test solution was added to the container, and then. Note
After heating to a suitable temperature in the container.
4 Reagents
During the assay, reagents used were of analytical grade (unless otherwise specified).
|