Measuring corrosion rate and protector effectiveness of advanced multilayer metallic materials by newly developed...

Area of Science:

• Materials Science
• Corrosion Engineering
• Electrochemistry

Background:

• Pitting corrosion poses a significant challenge for metallic materials.
• Multilayer metallic materials with internal protectors offer potential solutions.
• Understanding corrosion mechanisms is crucial for material development.

Purpose of the Study:

• To estimate the corrosion resistance of new multilayer metallic materials against pitting.
• To experimentally substantiate the mechanism of corrosive destruction in these materials.
• To develop and validate accelerated corrosion testing methods.

Main Methods:

• Electron microscopy for analyzing corrosive destruction mechanisms.
• Chemical methods for assessing internal protector effectiveness.
• Electrochemical methods for determining corrosion rates and limiting stages.

Main Results:

• Experimental substantiation of the layers' corrosive destruction mechanism.
• Development of chemical and electrochemical accelerated corrosion tests.
• The electrochemical method determines the mass corrosion index and guides protector selection.
• The chemical method quantifies protector effectiveness and material corrosion resistance ratios.

Conclusions:

• The proposed accelerated corrosion tests effectively evaluate multilayer materials.
• The electrochemical method provides insights into the rate-limiting step of corrosion.
• The chemical method offers a quantitative measure of internal protector performance.
• These methods aid in selecting optimal multilayer materials for specific corrosive environments.