ISO 7441:2015 pdf free
ISO 7441:2015 pdf free.Corrosion of metals and alloys – Determination of bimetallic corrosion in atmospheric exposure corrosion tests
When determining the risk of bimetallic corrosion, depending on the particular test, the specimens will not only suffer from increased corrosion due to bimetallic effects. For example, in the wire on bolt test the wire tension may influence the outcome of the test depending on the particular application. Therefore, several types of specimens (test specimens, reference specimens, standard specimens and control specimens) as defined in Clause 3 are needed depending on the purpose of the test programme.
NOTE Comparison of effects of test and reference specimens gives the relative risk of bimetallic corrosion but reference specimens are generally not suitable for evaluation of the absolute corrosion attack when there is no risk of bimetallic corrosion due to the particular design of the specimens. For evaluation of the absolute attack standard specimens are more suitable. Flat or irregularly shaped specimens can be used, as described in ISO 8565, depending on the intended use of the tested material. For example, hanging wires can be used as standard specimens for the wire on bolt test but flat panels can also be used if they are easily obtained and more closely resembles the shape of the intended use.
Control specimens shall be used if evaluation of mechanical properties is part of the test programme.Unless otherwise stated, the material, dimensions, direction of cutting, method of surface treatment and other parameters of anodic plates of test specimens, reference specimens and control specimens
shall be the same.
The test specimens shall be as shown in Figure 1 or Figure 2.
NOTE 1 The configuration shown in Figure 1 cannot be used for evaluation based on mass loss. The configuration shown in Figure 2 cannot be used for evaluation based on mechanical properties.
Anodic plates shall have a thickness of 1 mm to 6 mm and their length shall be suitable for tensile testing in accordance with ISO 6892-1.
Cathodic plates shall have thickness of 1 mm to 6 mm. In the case of precious metals, cathodic plates can consist of a foil covering a plate of inert material, such as plastic material. In this case, the foil and inert material assembly shall have a thickness of 1 mm to 6 mm.ISO 7441 pdf download.
