GB/T 28290-2012 English PDF

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GB/T 28290-2012: Methods for determination of surface chromium on electrolytic tinplate
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 28290-2012	229	Add to Cart	3 days	Methods for determination of surface chromium on electrolytic tinplate	Valid

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Basic data

Standard ID: GB/T 28290-2012 (GB/T28290-2012)
Description (Translated English): Methods for determination of surface chromium on electrolytic tinplate
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H25
Classification of International Standard: 77.140.01
Word Count Estimation: 10,140
Quoted Standard: GB/T 8170
Regulation (derived from): National Standards Bulletin No. 9 of 2012
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the use colorimetric determination of electrolytic tin plate surface chromium plating principle, reagents, test device, specimen, test conditions and procedures, test results, calculations, test reports. This standard applies to el

GB/T 28290-2012: Methods for determination of surface chromium on electrolytic tinplate

---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.
Methods for determination of surface chromium on electrolytic tinplate ICS 77.140.01 H25 National Standards of People's Republic of China Test Method for Chromium Content of Electroplated Tin Plates 2012-05-11 release 2013-02-01 Implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released

Foreword

The colorimetric method in this standard refers to ASTMA623M-08 "tinplate standard specification" Appendix A7 to develop, an increase of electrolysis. Compared with ASTMA623M-08 Appendix A7, the main changes in this standard are. --- Added terms and definitions; --- increased the principle; --- increase the sample; - the calibration of the spectrophotometer part of the calibration curve to add the technical content; - the calculation of the test results to add the contents of the numerical revision. This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183). The drafting of this standard. Wuhan Iron and Steel (Group) Company, Metallurgical Industry Information Standards Institute. The main drafters of this standard. single Kaijun, Li Xiaojie, Liu Baoshi, Huang Baihua, Hou Jie, Yu Wenli, Chen Xiaohong. Test Method for Chromium Content of Electroplated Tin Plates

1 Scope

This standard specifies the principle of colorimetric method, electrolysis method to determine the chromium content of electroplated tin plate, reagents, test equipment, samples, test conditions and Steps, the calculation of test results, test reports and so on. This standard is applicable to the determination of chromium content on the surface of electroplated tin plate. Color method as an arbitration law. Electrolysis method is recommended as a quick method The surface chromium content is not less than 2 mg/m2.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. Representation and Judgment of Numerical Correction Rule and Limit Value of GB/T 8170

3 terms and definitions

The following terms and definitions apply to this document. 3.1 Electroplated tinplate surface of chrome surfacechromiumonelectrolytictinplate In order to improve the corrosion resistance of tinplate, tin plating after the passivation treatment, in the tin plating surface deposition of chromium.

4 colorimetric method

4.1 Principles Dissolving the passivation film on the surface of the electroplated tin plate with a mixed solution of sodium hydroxide and sodium phosphate; dissolving the chromium oxide in the passivation film with potassium permanganate solution Into the hexavalent; with diphenylcarbazide solution color, with colorimetric determination of chromium, divided by the sample surface area, that is, per unit area The amount of chromium. 4.2 Reagents 4.2.1 Reagent and water purity. This test uses pure reagent and distilled water, or pure water of comparable purity. 4.2.2 Sodium hydroxide (NaOH) - sodium phosphate (Na3PO4) solution. Weigh 40.0 g of sodium hydroxide and 50.0 g of sodium phosphate into the water, dilute Released to 1.0L. 4.2.3 sulfuric acid (H2SO4) solution (1 3). take 100mL concentrated sulfuric acid (ρ1.84g/mL) slowly add 300mL of water, shake. 4.2.4 Potassium permanganate (KMnO4) saturated solution. 4.2.5 Hydrochloric acid (HCl, ρ1.19g/mL). 4.2.6 Diphenylcarbazide (C13H14N4O) solution. Weigh 0.2 g of diphenylcarbazide, dissolve in 10.0 mL of acetone, 10.0 mL Ethanol (95%) of 10.0 mL of phosphoric acid (85%), 10.0 mL of water. Preparation before use; once the color should be re-prepared. 4.2.7 Chromium standard solution A (chromium content 0.5mg/mL). Weigh 1.4140g potassium dichromate (K2Cr2O7) into the water, diluted to 1.0L. 4.2.8 chromium standard solution B (chromium content 0.01mg/mL). with a pipette to absorb 20mL standard solution A into the volumetric flask, with water dilute ......

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