Kovové koroze

Oblast zaměření: Kovové koroze
Komise : CEN/TC 262 (Metallic and other inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys)
Původce: CEN
K připomínkám do: 7.07.2020
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This document specifies a method for the measurement of metal coating thickness by first forming a step between the surface of the coating and the surface of its substrate and then measuring the step height using a profile recording instrument. It covers the instrumentation characteristics and the procedure appropriate to this specific application of profilometric methods.

The method is applicable to the measurement of thicknesses of metal coatings from 0,01 µm to 1 000 µm on flat surfaces and, if appropriate precautions are taken, on cylindrical surfaces. It is highly suitable for the measurement of minute thicknesses but, for thicknesses of less than 0,01 µm, surface flatness and surface smoothness are very critical and accordingly, the method is not recommended for use down to the lowest level of measurement usual for electronic stylus instruments. The method is suitable for measuring coating thicknesses when preparing coating thickness reference standards.

Oblast zaměření: Kovové koroze
Komise : CEN/TC 262 (Metallic and other inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys)
Původce: CEN
K připomínkám do: 7.07.2020
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This document specifies a method for the measurement of the local thickness of metallic coatings, oxide layers, and porcelain or vitreous enamel coatings, by the microscopical examination of cross sections using an optical microscope.

WARNING — The use of this Standard can involve hazardous materials, operations and equipment. This Standard does not purport to address all of the safety problems associated with its use. It is the responsibility of users of this standard to take appropriate measures to ensure the safety and health of personnel prior to application of the standard, and fulfil statutory and regulatory requirements for this purpose.

Oblast zaměření: Kovové koroze
Komise : CEN/TC 262 (Metallic and other inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys)
Původce: CEN
K připomínkám do: 14.08.2020
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This document specifies methods for the determination of

—    the presence of colourless chromate conversion coatings,

—    the presence of hexavalent chromium in colourless and coloured coatings on zinc or cadmium or aluminium-zinc (mass fraction of aluminium: 55 %, within a range of 54 % to 56 % mass fraction) and zinc-aluminium (mass fraction of aluminium: 5 %) alloys,

—    the total chromium content per unit area on zinc and cadmium,

—    the mass per unit area of both colourless and coloured coatings,

—    the satisfactory adhesion of chromate conversion coatings, and

—    the quality of chromate coatings.

These methods are applicable

—    to colourless and coloured chromate conversion coatings containing trivalent and hexavalent chromium in varying proportions and produced by either chemical or electrochemical processes, and

—    only to chromate coatings that are free from any supplementary coatings, such as oil, water or solvent-based polymers or wax.