GB/T 42513.4-2023Methods for chemical analysis of nickel alloys - Part 4: Determination of silicon content - Nitrous oxide-flame atomic absorption spectrometry and molybdenum blue spectrophotometry (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting:

This document is Part 4 of GB/T 42513 "Chemical Analysis Methods for Nickel Alloys": GB/T 42513 has released the following parts:

---Part 1: Determination of chromium content by ferrous ammonium sulfate potentiometric titration method;

---Part 2: Determination of phosphorus content by molybdenum blue spectrophotometry;

---Part 3: Determination of aluminum content by nitrous oxide-flame atomic absorption spectrometry and inductively coupled plasma atomic emission light spectrometry;

---Part 4: Determination of silicon content by nitrous oxide-flame atomic absorption spectrometry and molybdenum blue spectrophotometry;

---Part 5: Determination of vanadium content by nitrous oxide-flame atomic absorption spectrometry and inductively coupled plasma atomic emission light spectrum method:

This document is modified to adopt ISO 7530-8:1992 "Nickel alloy flame atomic absorption spectrometry Part 8: Determination of silicon content":

Compared with ISO 7530-8:1992, this document has many adjustments in structure: A comparison list of structural number changes between the two documents See Appendix A:

Compared with 7530-8:1992, there are many technical differences between this document and the clauses involved in the outer margins of the page:

Lines (|) are marked: A list of these technical differences and their causes is provided in Appendix B:

The following editorial changes have been made to this document:

---In order to coordinate with the existing standards, the name of the standard is changed to "Chemical Analysis Methods for Nickel Alloys Part 4: Determination of Silicon Content - Oxygen Nitrogen-flame atomic absorption spectrometry and molybdenum blue spectrophotometry";

---4.5.4.1 The dissolution of the sample in acid adds Notes 1 to 5 regarding sample dissolution:

Please note that some content in this document may be subject to patents: The publisher of this document assumes no responsibility for identifying patents:

Introduction

Nickel alloys are commonly used in instrumentation, electronic communications, pressure vessels, corrosion-resistant devices, and are widely used in aerospace and high-end special purposes:

Machinery and equipment manufacturing and other industries are one of the important metal raw materials for industrial development: There are dozens of international standards for chemical analysis methods of nickel alloys:

In:2017, with the progress of my country's industry, the demand for the production, import and export of high-end nickel alloy metals increased: To this end, international standards were transformed into national standards:

It is of great significance to assist the development and upgrading of non-ferrous industry and the development of domestic manufacturing industry: GB/T 42513 "Chemical Analysis Methods for Nickel Alloys" Purpose in establishing a complete and practical standard method for testing chromium, phosphorus, niobium, molybdenum, aluminum, vanadium, silicon, cobalt, copper and other elements in nickel alloys, transform it into the following international standards:

---ISO 7592:2017 Determination of chromium content in nickel alloys by ferrous ammonium sulfate potentiometric titration method;

---ISO 9388:1992 Determination of phosphorus content in nickel alloys by molybdenum blue spectrophotometry;

---ISO 7530-7:1992 Flame atomic absorption spectrometry analysis of nickel alloys Part 7: Determination of aluminum content;

---ISO 7530-8:1992 Flame atomic absorption spectrometry analysis of nickel alloys Part 8: Determination of silicon content;

---ISO 7530-9:1993 Flame atomic absorption spectrometry analysis of nickel alloys Part 9: Determination of vanadium content;

---ISO 11435:2011 Determination of molybdenum content in nickel alloys by inductively coupled plasma atomic emission spectrometry;

---ISO 7530:2015 Flame atomic absorption spectrometry analysis of nickel alloys Part 1: Determination of cobalt, chromium, copper, iron and manganese content;

---ISO 22033:2011 Determination of niobium content in nickel alloys by inductively coupled plasma atomic emission spectrometry;

---ISO 11436:1993 Determination of total boron content in nickel and nickel alloys Curcumin spectrophotometric method;

---ISO 23166:2018 Determination of tantalum content in nickel alloys by inductively coupled plasma atomic emission spectrometry:

GB/T 42513 is planned to consist of 13 parts:

---Part 1: Determination of chromium content by ferrous ammonium sulfate potentiometric titration method:

---Part 2: Determination of phosphorus content by molybdenum blue spectrophotometry:

---Part 3: Determination of aluminum content by nitrous oxide-flame atomic absorption spectrometry and inductively coupled plasma atomic emission light spectrum method:

---Part 4: Determination of silicon content by nitrous oxide-flame atomic absorption spectrometry and molybdenum blue spectrophotometry:

---Part 5: Determination of vanadium content by nitrous oxide-flame atomic absorption spectrometry and inductively coupled plasma atomic emission light spectrum method:

---Part 6: Determination of molybdenum content by inductively coupled plasma atomic emission spectrometry:

---Part 7: Determination of cobalt, chromium, copper, iron and manganese content by flame atomic absorption spectrometry:

---Part 8: Determination of niobium content by inductively coupled plasma atomic emission spectrometry:

---Part 9: Determination of total boron content of curcumin spectrophotometrically:

---Part 10: Determination of trace element content by glow discharge mass spectrometry:

---Part 11: Determination of silicon, manganese, phosphorus, chromium, nickel, copper, molybdenum, cobalt, iron, aluminum, vanadium, titanium, tungsten and niobium content by X-ray fluorescence spectrometry (common law):

---Part 12: Determination of tantalum content by inductively coupled plasma atomic emission spectrometry:

---Part 13: Determination of oxygen, nitrogen and hydrogen content: Inert gas melting - thermal conductivity method/infrared absorption method:

Adding silicon element to nickel alloy can significantly reduce the melting point of the alloy, expand the solid-liquidus temperature zone, and form a low-melting eutectic; it has deoxidation and reduction effects and slagging function; it can harden and strengthen the coating; it can improve operating process performance, etc: This document can promote my country's nickel alloy testing technology the advancement of technology ensures that industry practitioners have standards to follow in the production, application, scientific research, and testing processes, and fills the gap in the measurement of silicon content in nickel alloys in my country:

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Nickel alloy chemical analysis method Part 4: Determination of Silicon Content Nitrous Oxide -Flame atomic absorption spectrometry and molybdenum blue spectrophotometry Warning---Personnel using this document should have regular laboratory work experience: This document does not address all possible security issues question: Users are responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated in relevant national regulations:

1 Scope

This document describes methods for the determination of silicon content in nickel alloys by nitrous oxide-flame atomic absorption spectrometry and molybdenum blue spectrophotometry:

This document applies to the determination of silicon content in nickel alloys, Method 1: Determination range of nitrous oxide-flame atomic absorption spectrometry (mass Fraction) is 0.2%~1%; Method 2: The measurement range (mass fraction) of molybdenum blue spectrophotometry is 0.050%~4.20%:

2 Normative reference documents

This document has no normative references:

3 Terms and definitions

There are no terms or definitions to be defined in this document:

4 Method 1: Nitrous oxide-flame atomic absorption spectrometry

4.1 Principle

Dissolve the sample in acid, and inhale the test solution into the nitrous oxide flame of the atomic absorption spectrometer in hydrochloric acid-dilute hydrofluoric acid medium:

, use the nitrous oxide flame at the wavelength of 251:6nm of the atomic absorption spectrometer to measure the absorbance of silicon, and use the working curve method to calculate the silicon content:

4.2 Reagents

Warning---Hydrofluoric acid (4:2:3) is extremely irritating and corrosive to skin and mucous membranes, causing severe skin burns and slow healing:

In case of contact with skin, rinse with water and seek medical advice:

Mixed acids (4:2:4) are unstable and highly corrosive: Toxic gas (chlorine) will be released when left standing, so preparation should be done in a fume hood:

carried out and should not be stored in closed containers:

Unless otherwise stated, only reagents confirmed to be of analytical grade and distilled water or water of equivalent purity are used during analysis:

4.2.1 Hydrochloric acid: rho=1:18g/mL:

4.2.2 Nitric acid: rho=1:41g/mL:

4.2.3 Hydrofluoric acid: rho=1:15g/mL:

4.2.4 Nitric acid-hydrochloric acid mixed acid: Carefully mix 25mL nitric acid (4:2:2) and 75mL hydrochloric acid (4:2:1): The mixed solution is unstable:

Ready to prepare:

4.2.5 Hydrofluoric acid (1 9):