GB/T 41898-2022 PDF EnglishUS$110.00 · In stock · Download in 9 seconds
GB/T 41898-2022: Determination of corrosion resistance and compactness of inner coating or laminated-film in metal containers used for food - Electrochemical method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 41898-2022: Determination of corrosion resistance and compactness of inner coating or laminated-film in metal containers used for food - Electrochemical method---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT41898-2022 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 67.250 CCS A 82 Determination of Corrosion Resistance and Compactness of Inner Coating or Laminated-film in Metal Containers Used for Food - Electrochemical Method ISSUED ON: NOVEMBER 8, 2022 IMPLEMENTED ON: JUNE 1, 2023 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative References ... 4 3 Terms and Definitions ... 4 4 Principle ... 4 5 Reagents and Materials ... 4 6 Instruments and Equipment ... 5 7 Test Procedures ... 5 8 Result Expression ... 6 Determination of Corrosion Resistance and Compactness of Inner Coating or Laminated-film in Metal Containers Used for Food - Electrochemical Method1 ScopeThis document describes the method of determining the corrosion resistance and compactness of the inner coating and laminated film in metal containers used for food. This document is applicable to the determination of food (cans and beverages, etc.) metal containers based on coated tin-plated or chrome-plated steel sheets (aluminum) and coated iron (aluminum) substrates.2 Normative ReferencesThe contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods QB/T 2763 Coated Tinplate (or ECCS)3 Terms and DefinitionsThis document does not have terms or definitions that need to be defined.4 PrincipleBy accelerating the electrochemical corrosion of the inner wall of food metal containers, characterize its corrosion resistance. By applying a weak voltage on the inner wall of the metal containers, test the surface double-electron layer capacitance value and the dielectric loss tangent value to characterize its compactness.5 Reagents and MaterialsUnless it is otherwise specified, only analytically pure reagents are used. 7.1.1 At the edge of mouth of the metal container, use a knife to cut the coating film; connect the wire to the exposed iron part and connect the positive electrode of the stable power supply. 7.1.2 At room temperature, pour the test solution (5.2) into the metal container, until the liquid surface is 5 mm ~ 7 mm away from the mouth of the tank; the metal cover shall clamp the sample to the special fixture. Then, pour the test solution (5.2) to immerse the entire test plane. Take the sample piece as the positive electrode, and the stainless-steel electrode with a diameter of 4 mm and a length of 10 mm as the negative electrode; connect a 15 V DC power supply to cause corrosion of the positive electrode. After 1 h, take out the metal container, wash and dry it; observe the size and quantity of corrosion spots. 7.1.3 For some specific products, upon mutual agreement, other corrosive media (for example, canned food contents) can be used, and the test procedures are the same as 7.1.1 and 7.1.2. 7.1.4 The corrosion resistance of the sample shall be rated in accordance with the arithmetic mean of the quantity of corrosion spots of the same size in three metal containers. 7.2 Compactness 7.2.1 At the edge of mouth of the metal container, use a knife to cut the coating film; connect the wire to the exposed iron part, and connect the test electrode of the digital electric bridge. 7.2.2 At room temperature, then, pour the test solution (5.2) into the empty tank, until the liquid level is 3 mm ~ 8 mm from the tank mouth; the metal cover shall clamp the sample to the special fixture. Then, pour the test solution (5.2) and immerse the entire test plane. Maintain continuous immersion at room temperature for 24 h. 7.2.3 After the immersion is completed, use the digital electric bridge, and under the weak voltage of 100 mV and 1,000 Hz, measure the capacitance value and dielectric loss tangent value of the organic film on the inner wall of the metal container or metal cover. Convert the measured capacitance value into the capacitance value per unit area per square centimeter or unit area per 25 square centimeters. 7.2.4 For some specific products, upon mutual agreement, other corrosive media (for example, canned food contents) can be used, and the test procedures are the same as 7.2.1 and 7.2.2. 7.2.5 The capacitance value and dielectric loss tangent value of the sample shall be the arithmetic mean of the measured values of three metal containers. 7.2.6 The absolute difference between two independent determination results obtained under repeatability conditions shall not exceed 10% of the arithmetic mean.8 Result ExpressionThe test report shall include the following parts: a) Serial No. of this document; ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 41898-2022 be delivered?Answer: The full copy PDF of English version of GB/T 41898-2022 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 41898-2022_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 41898-2022_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 41898-2022 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.How to buy and download a true PDF of English version of GB/T 41898-2022?A step-by-step guide to download PDF of GB/T 41898-2022_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 41898-2022". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
