Home About Us Analytical Techniques Problem Solving Analysis Consultancy Industrial Sectors Contact Us
Problem Solving
Aqueous Corrosion of Metals
Typical Technical Expertise
Interface Adhesion, Adhesives and Coatings
Composite Release Films and Mould Release Agents
Corrosion, Degradation and Oxidation
Galvanic Pitting and Crevice Corrosion
Plastics Rubbers and Coating Degradation
Pharmaceutical Particle Counting
Particle Contamination Identification
Particle Identification Methodology
Materials, Product and Process Reverse Engineering
Chemical Product Deformulation and Reformulation
Electronic Devices and PCB Failure Investigations
Chemical Cleaning, Degreasing and Rinsing
Surface Preparation, Chemical Etching, Electrochemical and Pickling Processes
Paint, Adhesive, Sealant and Gasket Filler Fingerprinting
Thermionic Emission - Cathode and Source Development
Electronic Cigarette Chemical Evaluation
Index of Typical Laboratory Support Work

Contact Us
Print this page

immersion heater aqueous corrosion inside water systemAqueous corrosion occurs in countless industrial and domestic environments and can manifest itself in many forms, from uniform corrosion to localised corrosion such as pitting corrosion or crevice corrosion. Corrosion can also occur in conjunction with static or cyclic stress regimes and in these synergistic corrosion mechanisms, such as stress corrosion cracking and corrosion fatigue, the rate of crack propagation can be significantly fast. High-temperature corrosion occurring in hot and aggressive gases is termed oxidation.

Often components fail due to corrosion. Metallurgical failure examination of the failed component can help to identify the cause of the corrosion and ways to prevent or at least mitigate future damage caused by corrosion. Metallographic examination is sometimes required to determine the type of corrosion and SEM/EDX analysis of the corrosion products can help identify the aggressive species that played a role in the corrosion process.

Ion Chromatography IC can be used to help identify the corrosive species and combined with pH and conductivity measurements can determine the likelihood of a metal to corrode in environmental conditions.

LPD Lab Services can perform electrochemical corrosion testing using a potentiostat to determine the corrosion rate of metals and alloys in a given aqueous environment. This is particularly handy if a client wants to determine the effect of a new product, such as an additive or corrosion inhibitor, on the corrosion behaviour of the materials in the system that the new product would be used in, or selecting the most suitable material for a certain environment. Electrochemical corrosion testing methods can also determine the galvanic effect on corrosion when two dissimilar metals or alloys are combined.

Water Pipe Support Bracket RustingCorrosion processes are mostly electrochemical in nature. It requires an aqueous environment where an oxidation reaction occurs on anodic areas on the metallic component and a reduction reaction, or more than one reduction reaction, occurs on cathodic areas which could occur on the same metallic component or remotely, but electrically connected. Even in the case of atmospheric corrosion the surface is exposed to a thin layer of moisture, sometimes with successive wet and dry periods.

The reduction reaction consumes electrons and is what drives the corrosion process. There are a number of possible reduction reactions and the active reaction is depended on the corrosion environment, i.e. species present, pH, temperature and magnitude of any impressed current.

Even if corrosion does not lead to fracture or rupture it can cause loss of efficiency, due to loss of critical dimensions, or contamination of product, such as copper oxide in drinking water or rust in canned food.

Typical causes of corrosion, to name a few, can include:

Copyright 2021 LPD Lab Services Ltd. All rights reserved.