---
type: "WebPage"
title: "Galvanic Coupling Test – Electrochemical Test"
description: "Would you like to carry out a galvanic coupling test What is galvanic coupling? Le couplage galvanique désigne un phénomène électrochimique qui se produit lorsque deux métaux ou alliages, de nature différente, sont en contact électrique dans un même électrolyte.Cela..."
resource: "https://filab.fr/en/our-services/our-expertise-services/electrochemical-characterization/galvanic-coupling-testing/"
tags: ["EN", "pll_6855150d2c662", "Alexandre VIGLIONE"]
timestamp: "2026-05-19T09:54:35Z"
published: "2025-06-20T08:25:48Z"
language: "en"
author: "Laure Durieux"
---

# Galvanic Coupling Test – Electrochemical Test

## Would you like to carry out a galvanic coupling test

### What is galvanic coupling?

Le **couplage galvanique** désigne un phénomène électrochimique qui se produit lorsque deux métaux ou alliages, de nature différente, sont en contact électrique dans un même électrolyte.
Cela peut entraîner une **corrosion accélérée de l’un des deux matériaux**, appelé l’anode galvanique.

En laboratoire, l’essai de couplage galvanique permet de **quantifier ce risque** et d’anticiper les comportements corrosifs dans des conditions maîtrisées et reproductibles.

La [caractérisation électrochimique](https://filab.fr/en/our-services/our-expertise-services/electrochemical-characterization.md)  et l’essai de couplage galvanique peuvent s’appliquer à de nombreux secteurs industriels, de l’[aéronautique](https://filab.fr/en/sectors-of-activity/laboratory-analysis-aeronautics-aerospace.md) à la [cosmétique](https://filab.fr/en/sectors-of-activity/laboratory-analysis-cosmetics.md), en passant par l’[énergie](https://filab.fr/en/sectors-of-activity/laboratory-analysis-nuclear-energy.md), le [BTP](https://filab.fr/secteur-activite/laboratoire-expertise-materiaux-btp-analyse-defaillances-conformite.md) et les [dispositifs médicaux](https://filab.fr/en/sectors-of-activity/laboratory-analysis-medical-devices.md).

### Why carry out a galvanic coupling test?

  galvanic coupling test
##

 This test is essential to:
Identify material incompatibilities in multi-metal assemblies

Validate material choices before production launch

Study the behavior of systems in aggressive environments (marine, acidic, chloride-rich environments, etc.)

Optimize the service life of a device or protective coating

Understand corrosion phenomena observed in service

## The FILAB laboratory supports you in the galvanic coupling testing of your materials

## Why choose FILAB for a galvanic coupling test

FILAB, a laboratory made up of experts in [metallurgy and steelmaking](https://filab.fr/en/sectors-of-activity/laboratory-metallurgy-steelmaking-analysis.md) analysis, provides its knowledge and expertise to carry out your galvanic coupling tests and the electrochemical characterization of your metal parts.

## ANALYTICAL TECHNIQUE

A **galvanic coupling test** involves **bringing two different materials into electrical contact, immersed in the same electrolyte,** in order to observe and measure the resulting galvanic corrosion phenomena.

The measured current reflects the intensity of galvanic corrosion. The more anodic material corrodes in favor of the more noble (cathodic) one. This makes it possible to identify the material at risk, quantify the severity of the coupling, and propose solutions.

This technique makes it possible to **assess the performance of anti-corrosion coatings and the resistance of aerospace alloys** in acidic environments, by providing reliable data on long-term degradation mechanisms.

## Common applications for a galvanic coupling test

  Batteries and accumulators: validation of initial OCV, aging Anti-corrosion coatings: assessment of passive protection Material development: study of interfacial reactions Industrial maintenance: diagnosis of failing electrochemical systems
## our electrochemical analysis services

[Open-circuit potential (OCV) measurement](https://filab.fr/en/our-services/our-expertise-services/electrochemical-characterization/free-potential-measurement-ocv.md) to assess the spontaneous electrochemical behavior of a metal in a given medium (water)

Galvanic coupling study to analyze the interactions between two metallic materials and identify the risks of differential corrosion (e.g., zinc vs. steel)

Characterization of protective properties: barrier properties, porosity, water permeability, delamination, filiform corrosion…

[Impedance measurement](https://filab.fr/en/our-services/our-expertise-services/electrochemical-characterization/impedance-measurement.md) to analyze the properties of interfaces between a material and its electrochemical environment

[Corrosion rate determination (LSV)](https://filab.fr/en/our-services/our-expertise-services/electrochemical-characterization/study-corrosion-speed.md) to determine the corrosion rate (mm/year) in various environments (salt water, pure water, presence of inhibitors)

Corrosion potential measurement (polarization curves) using [Potensiostat](https://filab.fr/en/our-technical-resources/potensiostat-analysis.md)

Development of specific electrochemical tests (cathodic delamination, ACET, edge corrosion...)

## FAQ

 In which industrial sectors is OCV measurement used?
Open-circuit potential measurement is used in many sectors:

- Energy (batteries, fuel cells)
- Aerospace & automotive (alloy corrosion)
- Medical devices (biocorrosion)
- Cosmetics and pharmaceuticals (packaging materials)
- Nuclear and defense (stability monitoring of sensitive materials)

 What is the difference between OCV and other electrochemical tests?
Unlike techniques such as linear polarization or EIS (electrochemical impedance spectroscopy), OCV does not stress the system. It is a **passive** measurement, often used as a **preliminary step** or as a reference indicator.

 Which conditions can influence the measurement?
Several parameters must be controlled:

- Electrolyte composition
- Temperature
- Sample surface preparation
- Type and position of the electrodes

At the FILAB laboratory, these parameters are strictly controlled to ensure the **reliability of the results**.

 Do you offer support with interpretation?
Yes. Our experts support you beyond the measurement, with technical interpretation, customized reports, and practical recommendations tailored to your industrial challenges.