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GB/T 16545-2015: Corrosion of metals and alloys -- Removal of corrosion products from corrosion test specimens Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 16545: Historical versions
Similar standardsGB/T 16545-2015: Corrosion of metals and alloys -- Removal of corrosion products from corrosion test specimens---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/GBT16545-2015 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.060 H 25 GB/T 16545-2015 / ISO 8407.2009 Replacing GB/T 16545-1996 Corrosion of metals and alloys - Removal of corrosion products from corrosion test specimens (ISO 8407.2009, IDT) Issued on: SEPTEMBER 11, 2015 Implemented on: JUNE 1, 2016 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration Committee. Table of ContentsForeword ... 3 1 Scope ... 5 2 Procedures ... 5 3 Test report ... 8 Annex A ... 10ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 16545-1996 “Corrosion of metals and alloys - Removal of corrosion products from corrosion test specimens”. Compared with GB/T 16545-1996, the main technical changes in this Standard are as follows. - modified chemical and electrolytic cleaning methods for removal of corrosion products; - added suggestion for use of ultrasonic cleaning; - added the change with time in specimen quality change curve; - added requirements for number of corrosion in test report; - deleted some of the chemicals used, the cleaning temperature and time in Annex A; - added some of the chemicals used, the cleaning temperature and time, notes in Annex A. This Standard uses translation method to make it identical with ISO 8407.2009 Corrosion of metals and alloys - Removal of corrosion products from corrosion test specimens. This Standard makes the following editorial modifications. - used “this Standard” to replace “this International Standard”; - in order to comply with the preparation rules of Chinese standard, on the basis of unchanged structure, added clause number of Clause 2 and Clause 3, for easy use. This Standard was proposed by China Iron and Steel Association. This Part shall be under the jurisdiction of National Technical Committee on Steel of Standardization Administration of China (SAC/TC 183). The drafting organizations of this Standard. Jiangsu Ship Metal Materials Quality Supervision and Inspection Center, Metallurgical Industry Information Standards Institute, Jiangyin South Pipe Manufacturing Co., Ltd., Jiangyin Zhongnan Heavy Industry Co., Ltd., Central Iron and Steel Research Institute, Shougang Group. Main drafters of this Standard. Xie Jianping, Zhang Qiang, Hou Jie, Lu Xiaobin, Jiang Chunlong, Chen Shaozhong, Feng Han, Wu Zhaohui. Corrosion of metals and alloys – Removal of corrosion products from corrosion test specimens1 Scope1.1 This Standard specifies procedures for the removal of corrosion products formed on metal and alloy corrosion test specimens during their exposure in corrosive environments. NOTE For the purpose of this Standard, the term “metals” refers to pure metals and alloys. 1.2 The specified procedures are designed to remove all corrosion products without significant removal of base metal. This allows an accurate determination of the mass loss of the metal, which occurred during exposure to the corrosive environment. 1.3 This Standard may, in some cases, also be applied to metal coatings. However, possible effects from the substrate must be considered.2 Procedures2.1 General 2.1.1 A light mechanical cleaning treatment by brushing with a soft bristle brush under running water should first be applied to remove lightly adherent or bulky corrosion products. 2.1.2 If the treatment described in 2.1.1 does not remove all corrosion products, it will be necessary to use other procedures. These are of three types. a) chemical; b) electrolytic; c) more vigorous mechanical treatments. NOTE These treatments will also remove some base metal. 2.1.3 Whichever method is used, it might be necessary to repeat the cleaning treatment to ensure complete removal of the corrosion products. Removal shall be confirmed by visual examination. The use of a low-power microscope (i.e. ×7 ~ ×30) is particularly helpful with a pitted surface since corrosion products 2.1.4.3 The true mass of the specimen, after removal of the corrosion products, will be a value between the masses represented by the points B and D, depending on the degree of protection furnished by the corrosion products during the cleaning procedure. 2.1.5 The preferred cleaning method will be that which a) provides efficient removal of corrosion products, b) provides low or zero mass loss when applied to new uncorroded specimens (see 2.1.4.1), and c) provides a curve of mass as a function of the number of cleaning cycles or time of pickling, which is close to horizontal when the latter is plotted as the abscissa (see 2.1.4.2). 2.1.6 When chemical or electrolytic procedures are used, solutions freshly prepared with distilled or deionized water and reagent grade chemicals shall be used. 2.1.7 After cleaning, the specimen should be thoroughly rinsed with tap water, a light brushing during this procedure will help to remove any remaining surface products resulting from the cleaning process. Finally, the specimens shall be rinsed with distilled or deionized water. The specimen shall then be rinsed thoroughly in ethanol and dried using a hot air blower or an oven. After that, the specimens shall be allowed to cool in a dessicator to the balance room temperature before weighing. 2.2 Chemical procedures 2.2.1 Chemical procedures involve immersion of the corrosion test specimen in a chemical solution which is specifically designed to remove the corrosion products with minimal dissolution of any base metal. Several procedures are listed in Annex A (see Table A.1). To facilitate the cleaning, it is strongly recommended to use an ultrasonic bath treatment. 2.2.2 Chemical cleaning is often preceded by light brushing of the test specimen to remove lightly adherent, bulky corrosion products. 2.2.3 Before the chemical treatment, clean the specimens as described in 2.1.1. In connection with the intermittent removal of specimens for weighing, brush the specimens, if necessary, to facilitate the removal of tightly adherent corrosion products. 2.3 Electrolytic procedures 2.3.1 Electrolytic cleaning can also be used to remove corrosion products. Several methods of electrolytic cleaning of corrosion test specimens are givenAnnex A(Informative) Chemical and electrolytic cleaning procedures for removal of corrosion products A.1 General This annex summarizes the selected chemical and electrolytic cleaning procedures. Prior to adopting these cleaning procedures, the user should conduct a test on control samples to ensure the efficiency of the chosen method. A.2 Procedures A.2.1 Tables A.1 and A.2 summarize various chemical and electrolytic cleaning procedures for removal of corrosion products. The specific choice of procedure for a given material will depend on many factors, including previous experience. If more than one chemical or electrolytic cleaning procedure is given for a metal, the procedures are usually listed in preferred order. This Standard should be consulted for guidance in the proper application of the procedures in Tables A.1 and A.2. A.2.2 For all the cleaning procedures listed, it is recommended that the surfaces should be maintained vertical during cleaning. This will minimize retention of any gases released during the cleaning procedure. A.2.3 The times specified represent recommendations appropriate for mass- loss studies in the context of Figure 1. However, when the cleaning procedure is adopted for other purposes (e.g. cleaning of fracture surfaces for inspection, using a microscope), the exposure time may be longer. NOTE When working with dangerous substances (such as cyanide, chromium trioxide, zinc dust), all necessary safety precautions shall be taken. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
