EN-248 pdf free download
EN-248 pdf free download. Sanitary tapware – General specification for electrodeposited coatings of Ni-Cr .
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).
EN ISO 10289:2001, Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates – Rating of test specimens and manufactured articles subjected to corrosion tests (ISO 10289:1999)
ISO 9227, Corrosion tests in artificial atmospheres – Salt spray tests.
4 Exposed surfaces
4.1 Condition of exposed surfaces
Exposed surfaces shall be protected against corrosion. 4.3 Visual examination before tests The exposed surfaces should be examined with the naked eye, from a distance of about 300 mm for approximately 10 s, without any magnifying device, in a light (diffused and not dazzling) of an intensity of 700 Lux to 1 000 Lux. 4.4 Requirements During examination, the exposed surfaces should not show any of the defects described in Table 1, with the exception of slight yellowish or bluish marks. 5 Quality of coating 5.1 Corrosion resistance test – test with neutral saline spray 5.1.1 General The test described is a type test (laboratory test), and not a quality control test carried out during manufacture. 5.1.2 Method Carry out the test under the conditions described in Iso 9227 specifically for the neutral saline-spray test, in the following way. Subject the parialy-dismantled tapware and its accessories to spraying for 200 h minimum, arranging a rest period of (48士1) h halfway through the treatment, ie after the first 100 h士1 h of spraying. During the rest period, maintain the heat of the tank. For the duration of the tests, the tank should only be opened to check and maintain the conditions, the maximum rest period in spraying being 30 min per day. The heating should not be interrupted; samples under test should not be handled, washed or checked. After treatment and before visual examination, rinse the test samples in water to remove any salt residue. After the test, examine the surfaces with the naked eye, for approximately 10 s, from a distance of about 300 mm, without any magniftying device. 5.1.3 Requirements After completing the salt-spray test, examine the test samples in the conditions specified in EN ISo 10289 in the following way. Examine the samples in accordance with 4.2 and 4.3. From this examination, define the area A covered by defects, as a percentage of the total area of the test piece. This surface area A should be less than or equal to0,1 % (A≤0,1 %). The defects should not exceed a dimension of 0,3 mm. (For an example see annex A an extract from EN ISO 10289:2001 showing a visual representation of the types of fault which correspond to the limit of 0,1 %). 5.2 Test for coating adherence – Test for resistance to thermal shock 5.2.1 General The test described is a type test (laboratory test) and not a quality control test carried out during manufacture. It applies only to plastic materials with Ni-Cr coating. 5.2.2 Method The test consists of subjecting samples to a series of thermal shocks, whereby the number of cycles, temperatures and durations are indicated in Table 2. For the defined cycles, the vector for heating and cooling is air. Before the introduction of the samples, all areas of the test environment should be at the set temperature and within the specified tolerance levels. The test sample shall be subjected to cycles described in Table 2, see also annex B (informative)EN-248 pdf download.
