Standards Development

Scope

The primary objectives of this guideline are to present a standard method for avoiding galvanic corrosion in the design stage, to present a standard method for determining whether actual corrosion damage was caused by galvanic corrosion, and to present a guideline for standard methods for suppressing galvanic corrosion that occurs in the presence of an electrolyte when two or more different types of electrically conductive materials, mainly metals, are in contact.

This guideline includes a method for analysis and prediction of galvanic corrosion in environments, mainly water, by numerical calculation based on polarization data.

Purpose

Use of multi-materials, in which not only metal materials but also ceramics, semiconductors, carbon fiber and resins are utilized in structures, is advancing rapidly in many industrial fields such as electronic components, automobiles, aircraft, plant systems and infrastructure, among others. Where corrosion is concerned, this has increased the possibility of galvanic corrosion, heightening the necessity of a comprehensive, cross-sectorial guideline for galvanic corrosion suppression that includes materials and their environments. However, the existing ISO standards do not contain clear provisions concerning galvanic corrosion or standards other than bolting of dissimilar materials. On the other hand, BEM (boundary element method) and FEM (finite element method) are techniques that enable modeling and numerical calculation of galvanic corrosion. Simulations by these techniques have progressed, and are already used in practical applications. Moreover, accompanying the application of multi-materials, carbon and other nonmetallic materials eluted from ceramics, CFRP or resins are related to galvanic corrosion and have become a critical issue in automobiles, aircraft, etc. Under these circumstances, a cross-sectorial ISO guideline on galvanic corrosion, with its many inherent issues, is necessary.