GOST 30082-93

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  ГОСТ 30082-93

GOST 30082−93 Alloys zinc-aluminum. Method of spectral analysis.

GOST 30082−93

Group B59

INTERSTATE STANDARD

ALLOYS ZINC-ALUMINUM

Method of spectral analysis.

Zinc-aluminium alloys. Spectral method of analysis

OKS 77.120*
AXTU 1709
____________________
* In the index «National standards», 2008
OKS 77.120.60. — Note the manufacturer’s database.

Date of introduction 1997−01−01

Preface

1 DEVELOPED by Eastern research mining and metallurgical Institute of nonferrous metals (VNIItsvetmet)

INTRODUCED by Gosstandart of the Republic of Kazakhstan

2 ADOPTED by the Interstate Council for standardization, Metrology and certification of March 15, 1994 (Report No. 1 map)

The adoption voted:

3 Decree of the Russian Federation Committee on standardization, Metrology and certification dated June 19, 1996 N 389 inter-state standard GOST 30082−93 introduced directly as state standard of the Russian Federation from January 1, 1997

4 INTRODUCED FOR THE FIRST TIME

1 SCOPE

This standard applies to zinc-aluminum alloys, designed for hot dip galvanized steel strip, and sets the spectral method for determination of aluminium, lead, cadmium, iron and copper in the alloys CA 03 CA 04 for the mass concentration of determined elements in percents:

Method of spectral analysis based on the excitation spectrum of the arc or spark discharge with photographic or photoelectric registration of the emission spectral lines of the identified elements.

2 NORMATIVE REFERENCES

The present standard features references to the following standards:

GOST 8.001−80* GSI. Organization and conduct of state measuring instruments
________________
* On the territory of the Russian Federation are PR 50.2.009−94**. Here and further.
** PR 50.2.009−94 abrogated on the basis of the order of the Ministry of industry and trade of 30.11.2009 N 1081, here and beyond. — Note the manufacturer’s database.

GOST 8.315−91* GSI. The standard samples. The main provisions, the order of development, certification, approval, registration and application
________________
* On the territory of the Russian Federation GOST 8.315−97. Here and further. — Note the manufacturer’s database.

GOST 8.326−89* GSI. Metrological certification of measuring instruments
________________
* On the territory of the Russian Federation there are PR 50.2.009−94. Here and further. — Note the manufacturer’s database.

GOST 83−79 Sodium carbonate anhydrous. Specifications

GOST 195−77 anhydrous Sodium sanitarily. Specifications

GOST 4160−74 Potassium bromide. Specifications

GOST 5644−75 sodium Sulfite anhydrous

GOST 6709−72 distilled Water

GOST 17261−77 Zinc. Method of spectral analysis.

GOST 19627−74 Hydroquinone (paradoxians). Specifications

GOST 25086−87 non-ferrous metals and their alloys. General requirements for methods of analysis

GOST 25664−83 Metol (4-methylaminophenol sulfate). Specifications

THAT 6−43−1475−88 photographic Plate for spectrographic SFC. Specifications

3 GENERAL REQUIREMENTS

3.1 General requirements for the method of analysis according to GOST 25086.

3.2 Samples the samples received for analysis in the form of rods of circular cross section with a diameter of (10±0,2) mm and a length of 50−100 mm or in the form of cylinders with a diameter of ~20 mm and height 10−20 mm.

Standard samples and incoming samples must be adequate in structure, shape and dimensions of the analyzed surface should be treated in the same way.

3.3 Numerical values of analysis results are rounded and expressed a number of bits equal to the number of bits corresponding allowable differences.

3.4 Control of the correctness of the results of the analysis carried out according to GOST 25086. The frequency of verification of results of the analysis are set based on the stability of the calibration parameters for each specific device.

Occasional inspection is carried out after the repair, preventive maintenance of the instrument and other changes in the terms of analysis.

3.5 the analytical instruments shall be tested in accordance with GOST 8.001 either need to be certificated according to GOST 8.326 or RD 50−674.

4 SAFETY REQUIREMENTS

Safety requirements — according to GOST 17261.

5 EQUIPMENT, MATERIALS, REAGENTS

Set of equipment for emission spectral analysis with photographic or photoelectric registration of spectrum, providing the necessary sensitivity.

Machine KP-35 or other device for processing the analyzed surfaces and samples.

Standard samples developed in accordance with GOST 8.315.

Protivoelektrodom made from the embers of the brand-3 on the other 16−538−240−74.

Photographic plates spectrographic SFC-02, the SFC-03, NT-2SV at THAT 6−43−1475.

Developer a metol-hydrochinone the following composition:

6 PREPARATION FOR ASSAY

The analyzed surface sample and carefully treated in the machine at the hemisphere (with photographic registration of spectra) or on a plane (with the photoelectric registration of the spectra) and some rubbing alcohol. On the treated surface of the analyzed samples and should not be holes, cracks, slag and non-metallic inclusions and other defects.

7 ANALYSIS

7.1 Spectra and samples prepared for analysis, photographed on the spectrograph in an electric arc or spark mode. As protivoelektrodom for use WITH an appropriate sample, sample — relevant sample, sharpened to a hemisphere, when sharpening on a plane, carbon rod, sharpened to a truncated cone with the diameter of the pad is ~1.5 mm.

7.1.1 Spark mode

The spark generator works in soft mode: the capacity of 0.01 UF, the inductance of 0.55 mH, a current of 1.5−2.0 A. the slit Width of the spectrograph 0.015 mm, the intermediate diaphragm is round. Firing for 60 s, exposure 30−35 C.

7.1.2 Arc mode

Alternating current arc power of 2.5−5 A. the slit Width of the spectrograph of 0.015−0.020 mm, the exposure 30−60 s.

7.2 For the analysis, you can use the device with photoelectric registration of spectrum, previously having selected the optimal conditions of excitation and registration of the spectra, allowing to obtain the necessary sensitivity and accuracy of analysis results. As counter electrode is used, offered by the manufacturer of the corresponding device, or a carbon rod.

8 PROCESSING OF RESULTS

8.1 Recommended analytical lines of the determined elements and the element comparison — zinc (wavelengths in nm):

According to the measured density values of pucherani analytical lines of the determined elements and element comparison to determine the difference pucherani . The calibration graphs are built in coordinates , where is the arithmetic average of the three spectrograms;

 — certified value of the mass fraction of the element.

8.2 by the photoelectric registration of spectrum you can use these analytical lines of the determined elements and comparison lines or pick up experimentally the other, giving sufficient sensitivity and free from overlap of interfering lines.

Calibration graphs in this case are built in coordinates ,

where the readings of the output of the measuring device, is proportional to the logarithm of the intensity of the lines defined element and an element of comparison;

 — certified value of the mass fraction of the element.

For quantometer in which the readings of the output device is proportional to the relative intensities of spectral lines of the calibration graphs built in the coordinates .

8.3 the result of the analysis be the arithmetic mean of results of two parallel measurements (three from each of the spectrograms) obtained on the same photographic plate when the photographic registration, and the arithmetic mean of the results of two parallel measurements (three measurements each) with photoelectric registration.

8.4 the Permissible discrepancy of the two results of parallel measurements () and the permissible discrepancy of the two results of the analysis of the same sample () at a confidence probability of 0.95, should not exceed the values listed in table 1.


Table 1 — allowable Absolute differences

Percentage

Permitted discrepancies for the intermediate mass fraction of impurities calculated by linear interpolation or according to the formulas:

, to lead;

,  — of cadmium;

,  — aluminium;

,  — for copper;

, for iron,

where  — the average of the two results of parallel measurements;

 — the average of the two results of the analysis of the same sample.