HG/T 2471-2011 in English

1 Scope

This standard specifies the requirements, test methods, inspection rules for coating of dimensionally stable anode for electrolyzer, and packaging, marking, storage and transportation of dimensionally stable anode.

This standard applies to the coating of dimensionally stable anode in the electrolyzer with ruthenium as the main body and titanium as the substrate for the diaphragm electrolyzer of the chlor-alkali industry (hereinafter referred to as the diaphragm cell), the sodium hypochlorite industry non-diaphragm electrolyzer(hereinafter referred to as the sodium hypochlorite cell) and the chlorate industry non-diaphragm electrolyzer (hereinafter referred to as the chlorate cell) with NaCl aqueous solution as the electrolyte.

2 Normative References

The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition applies.

GB/T 191 Packaging — Pictorial marking for handling of goods (GB/T 191-2008, eqv ISO 780: 1997)
GB/T 601 Chemical reagent — Preparations of reference titration solutions
GB/T 6682 Water for analytical laboratory use — Specification and test methods (GB/T 6682-2008, eqv ISO 3696: 1987)
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 9723 Chemical reagent — General rule for flame atomic absorption spectrometric analysis
HG/T 3679 Ruthenium trichloride for dimensionally stable anode coating in electrolyzer

3 Terms and Definitions

For the purpose of this standard, the following terms and definitions apply.


3.1
dimensionally stable anode
precious metal oxide anode coated on the titanium substrate with ruthenium as the main body

3.2
ruthenium content
mass of ruthenium in dimensionally stable anode coating per unit area

3.3
homogeneous degree
degree of uniformity of the coating indicated by the relative standard deviation of the ruthenium content or the corresponding quantity value measured at multiple points

3.4
chlorine-liberated potential
potential of calomel electrode relative to saturated potassium chloride solution when chlorine evolution electrolytic reaction is carried out at a specified current density

3.5
polarisability
rate of change of the corresponding electrode potential as the current density changes during an electrolytic reaction and is expressed as the amount of change in electrode potential when the current density is changed by one order of magnitude

3.6
fortifying life
cumulative time for the electrolytic reaction of dimensionally stable anode coating in a solution of specified concentration of H2SO4 at a specified current density until the termination of the reaction of the dimensionally stable anode coating

3.7
fortifying weightlessness
amount of reduction of coating mass after electrolytic reaction of dimensionally stable anode coating in NaOH solution of specified concentration and at specified current density for specified time

3.8
test sample
sample for testing the performance of dimensionally stable anode coating

3.9
test piece
unit sample(s) taken from test sample(s) according to regulations and used for inspection of various items

Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Materials
5 Requirements
6 Test samples
7 Test methods
8 Inspection rules
9 Packaging, marking, storage and transportation