Good corrosion prevention and early treatment are crucial strategies for protecting aircraft

Corrosion Inhibition for Aircraft, Aviation, and Aerospace Industries

Protecting the Aircraft Industry

Corrosion is a perennial problem in the aircraft industry, and preventing corrosion is a critical factor in maintaining the integrity and safety of an aircraft vehicle. Left undetected and untreated, aircraft corrosion can quickly lead to potentially catastrophic vehicle failure.

Causes of Corrosion

We all know that corrosion occurs when metal is exposed to oxygen and moisture...

- Corrosive chemicals or dissimilar metals can also initiate the corrosion process.

- Surface corrosion frequently occurs where metal is exposed or paint has worn thin.

- Stress corrosion is a common problem for aircraft under tensile stress in corrosive environments.

- Corrosion risks increase with aircraft age or exposure to extreme moisture and harsh environments.

Protection Methods

Good corrosion preventive maintenance and early treatment are crucial strategies for protecting aircraft from corrosion failure. Keeping a vehicle clean with corrosion inhibiting washes and storage methods helps protect aircraft from corrosion attack during regular use and storage. Sometimes rust removal may be needed before applying additional corrosion inhibitors, such as VpCI® primers and coatings, to an aircraft. Cortec® Vapour phase Corrosion Inhibitors (VpCIs) allow the slowing of corrosion attack on aircraft from multiple angles.

Corrosion Inhibitors (VpCIs) sullied by Presserv, Aberdeen UK, allow the slowing of corrosion attack on aircraft from multiple angles.
Corrosion Inhibitors (VpCIs) slow the attack of corrosion on aircraft from multiple angles.

Types of Corrosion

Surface Corrosion

Corrosion on aircraft surfaces can be indicated by roughening, etching, pitting, or blistering of the paint or plat- ing, as well as the presence of powdery deposits. Surface corrosion of the filiform type looks like the presence of worms under the paint.

Dissimilar Metal Corrosion

Electrochemical corrosion can occur when dissimilar metals come in contact with each other and create a galvanic action. This can cause pitting damage that is difficult to detect because it often arises in unseen areas of an aircraft.

Intergranular Corrosion

Flaking metal may be an indication of intergranular corrosion. This is usually instigated by lack of uniformity in the metal stemming back to the manufacturing process. Intergranular corrosion can be difficult to detect.

Stress Corrosion

The combination of a corrosive environment and tensile stress can result in stress corrosion cracking. This is common and often occurs in metal systems such as landing gear.

Fretting Corrosion

The slight rubbing of two mated surfaces can produce pitting and fine debris. Often the debris is trapped in tight locations. The problem worsens in the presence of moisture.

* Source: FAA AC 8083-30 Chapter 6: Aircraft Cleaning and Corrosion Control

Cortec® Advanced Technology

Cortec® has developed technology to fit the ever increasing demands for better corrosion control measures in the aviation industry. Thanks to the development of new technologies and the committed work of their scientists and engineers Cortec are able to use the most innovative advanced corrosion protection method available today - the application of VpCI®. VpCI is a safe, cost-effective method for preventing severe damage caused by corrosive processes in the aircraft industry. Cortec’s technology and products offer highly efficient and economical protection enabling our customers to effectively fight corrosion while decreasing their costs.

Vapour Phase Corrosion Inhibitors (VPCI®)

VpCI® Technology is an innovative, environmentally safe, cost-effective option for corrosion protection protecting with a thin, mono-molecular protective barrier.

Unlike conventional corrosion inhibiting methods, VpCls create a barrier that re-heals and self-replenishes itself, and can be combined with other functional properties for added protective capabilities. VpCI® physically adsorbs on metal surfaces creating a barrier layer against aggressive ions. VpCI® additives offer highly efficient, pro-environmental, and economical corrosion protection for process systems.

While conventional corrosion inhibiting treatments provide protection at the liquid phase only, Cortec® VpCl® Technology provides corrosion protection in the liquid phase, interphase, and vapour phase.

How Cortec® Can Cut Costs

- Water-based and multi-purposed VpCls are more economical than conventional oil-based rust preventatives.

- Efficient application results in labour savings. - VpCIs offer improved health, safety, and pollution control characteristics. - There is no need to remove the VpCI® protection layer, eliminating extra processing steps. - VpCI® treatments virtually eliminate economic loss due to rust, speckling, staining, and other forms of corrosion, cutting rust claims and returns while improving the quality of your product.

Continuous VpCI® Protection

Unlike conventional methods, Cortec® VpCls can be injected into a system at multiple points and go to work immediately, are self-replenishing to provide continuous, uninterrupted protection in the liquid phase, interphase, and vapour phase.

For example, the automatic injection of Cortec® VpCIs into a system — with no attendance operator — provides protection immediately, even on pre-rusted or scaled surfaces.

Environmental Safety

Cortec’s VpCI® Technology provides a new, pro-environmental set of answers. It offers the most environmentally safe method of corrosion prevention available today, with low toxicity and low polluting effects. As a chemical company, Cortec® believes in intelligent design and commitment to pro-environmental manufacturing and practices. Our commitment is reflected with Cortec’s certification under the ISO 14001: 2008 Environmental Standard. Unlike corrosion inhibiting systems of the past, many Cortec® VpCls do not contain chromates or other heavy metals, nitrites, or chlorinated hydrocarbons. With the support of our corrosion scientists, engineers, and testing facility, Cortec® provides simple, environmentally friendly, cost-effective solutions to corrosion problems.

Cortec® Products - Summary & Benfits

  • Saves costly time and labour

  • Protects the environment

  • Offers complete package solutions

  • Disperses in water, oils, solvents

  • Formulates easily

  • Protects multi-metals

  • Comes in multifunctional products

  • Does not alter emulsion properties

  • Protects against SCC (Stress Corrosion Cracking) and HE (Hydrogen Embrittlement)

  • Requires little or no surface preparation

  • Prevents further corrosion of ferrous surfaces

  • Does not interfere with operation of mechanical components

Micro Corrosion Inhibiting Coatings Powered by Nano VpCI

Traditional coatings rely on sacrificial metals (zinc, chromates, aluminum) for inhibition. Due to the large particle size of these inhibitors, gaps exist which allow corrosion to start and eventually expand, causing coating failure. Cortec® Nano VpCITM coatings use the patented VpCI® Technology to protect the metal substrate with a tight bonding molecular structure. This system eliminates the gaps which occur with traditional inhibitors and prevents corrosion from starting. Cortec® offers VpCI® primer (a corrosion inhibiting base coat with good adhesion to aluminium), VpCI® top clear coat for exteriors, and VpCI® interior coating for protection of vulnerable internal surfaces.

Read Case Study:

Preservation of Naval Aircraft Engines