ISO 8057:2024

Current Revision
Determination of galvanic corrosion rate for assembled forms of carbon fibre reinforced plastics (CFRPs) and protection-coated metal - Electrochemical tests in neutral sodium chloride solution

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ISO 8057:2024

This document specifies the electrochemical test for determining galvanic corrosion rate of CFRPs and metal assemblies with protection-coating, subjected to the corrosive environment of electrolyte diffusion through the coating.

It specifies the apparatus, the test solutions, and the procedure to be used in conducting the electrochemical tests for:

  • a) the assessment of the Fick's diffusion parameter for protective coating on metallic materials, and
  • b) the estimation of the galvanic corrosion rates with the conversion of ISO 21746 coating-free sample data.

The following are intended situations of implementing an electrochemical test based on this document:

  • a) when interested parties estimate the galvanic corrosion rate of bonded joints relating engineering metals with protection-coating and CFRPs of the potential drastically nobler than those of most metals, utilizing the resources of ISO 17475;
  • b) when expanding CFRP-metal bonded joints applications using coatings to the fields of corrosion-sensitive environments caused by electrolytes.

It is not the intent of this document to fulfil the need for:

  • omitting relevant field tests for the applications in corrosive environment;
  • superimposing test data for specific applications for the range of relevant data;
  • comparative testing as a means of ranking different protections with respect to corrosion rates;
  • ignoring the field hazards such as erosion, abrasion, and ultraviolet irradiation.
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