Kovové koroze

Oblast zaměření: Kovové koroze
Komise : CEN/TC 219 (Cathodic protection)
Původce: CEN
K připomínkám do: 20.11.2018
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Scope

This document describes the general principles for the implementation and management of a system of cathodic protection against corrosive attacks on structures which are buried or in contact with soils, surface fresh waters or underground waters, with and without the interference of external electrical sources. It specifies the protection criteria to be achieved to demonstrate the cathodic protection effectiveness.

For structures that cannot be electrically isolated from neighbouring influencing structures, it may be impossible to use the criteria defined in the present document. In this case, EN 14505 will be applied (see 9.4 “Electrical continuity/discontinuity”).

To assist in forming a decision whether or not to apply cathodic protection the corrosion likelihood can be evaluated using Annex A. Annex A summarizes the requirements of EN 12501‑1 [2] and EN 12501‑2 [3].

Cathodic protection of structures immersed in seawater is covered by EN 12473 and a series of standards more specific for various applications.

Cathodic protection for reinforced concrete structures is covered by EN ISO 12696.

This document is applicable in conjunction with:

—    EN ISO 15589‑1 for application for buried or immersed cathodically pipelines,

—    EN 50162 to manage d.c. stray currents,

—    EN ISO 18086 to manage corrosion due to a.c. interference from high voltage power sources and a.c. traction systems,

—    EN 13509 for cathodic protection measurement techniques

—    EN 50443 to manage protection for touch and step voltage.

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: 27.11.2018
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This International Standard specifies the minimum requirements and the functional characteristics of enamel coatings applied by any process, such as wet dipping, wet flow-coating, wet spraying, wet electrostatic spraying, wet electrodeposition or dry-powder electrostatic spraying, to profiled steel heat exchanger panels in regenerative heat exchangers, before and after packing in baskets.

For very severe service conditions, or to obtain extended operational life, more stringent limits may be agreed between customer and supplier.

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: 30.11.2018
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This document specifies a method for using phase sensitive eddy current instruments for non-destructive measurements of the thickness of non-magnetic metallic coatings on metallic and non-metallic basis materials such as:

zinc, cadmium, copper, tin or chromium on steel;

Copper or silver on composite materials.

The phase sensitive method can be applied without thickness errors to smaller surface areas and to stronger surface curvatures than the amplitude sensitive eddy current method specified in ISO 2360, and is less affected by the magnetic properties of the basis material. However, the phase sensitive method is more affected by the electrical properties of the coating materials.

In this document the term “coating” is used for materials such as, for example, paints and varnishes, electroplated coatings, enamel coatings, plastic coatings, claddings and powder coatings.

This method is particularly applicable to measurements of the thickness of metallic coatings. These coatings can be non-magnetic metallic coatings on non-conductive, conductive or magnetic base materials, but also magnetic coatings on non-conductive or conductive base materials.

When measuring metallic coatings on metallic basis material, the product of conductivity and permeability (σm) of one of the materials should be at least a factor of 2 times the product of conductivity and permeability for the other material. Non-ferromagnetic materials have a relative permeability of 1.