How to Protect Military Equipment from Corrosion in Harsh Environments
How to Protect Military Equipment from Corrosion in Harsh Environments
Corrosion is one of the most persistent and costly threats facing defence equipment worldwide. It doesn’t announce itself. It works gradually, invisibly, and continuously, degrading structural integrity, compromising sensitive components, and ultimately taking assets out of service at exactly the moment they may be needed most.
The scale of the problem is significant. The US Department of Defense spends around $20 billion annually on corrosion maintenance, close to 20% of every dollar budgeted for maintenance purposes. Research by LMI found that corrosion accounts for approximately 24% of maintenance costs for weapon systems and equipment across the US military. While comparable UK-specific figures are not publicly broken down in the same way, the proportional challenge for the MOD is widely understood to be equivalent and with MOD global expenditure reaching £38 billion in 2024/25, the financial stakes of inadequate corrosion management are substantial.
Beyond cost, the operational consequence is the one that matters most: corrosion negatively affects all military assets, both equipment and infrastructure and takes critical systems out of action while creating safety hazards. In a defence context, that translates directly to reduced readiness and compromised capability.
Why Defence Environments Are Uniquely Challenging
Commercial equipment faces corrosion. Military equipment faces corrosion in conditions that are specifically designed to be hostile to both people and machinery.
The environments in which defence assets are stored, transported and operated cover an extreme range and each presents its own corrosion profile.
Maritime and coastal environments expose equipment to salt-laden air and direct saltwater contact. Salt accelerates electrochemical corrosion significantly, attacking metal surfaces and penetrating joints, seals and electrical contacts. Naval vessels, coastal installations and amphibious equipment face continuous exposure that standard corrosion protection measures are not always sufficient to manage without ongoing maintenance.
Desert and arid environments present a different but equally damaging challenge. Fine sand and dust particles infiltrate mechanical systems, abrade protective coatings and act as carriers for moisture accelerating surface corrosion on exposed metalwork and degrading seals and gaskets over time. UV exposure at high intensity also degrades polymer components, covers and seals.
Cold and arctic environments create temperature cycling effects that stress protective coatings, cause condensation inside sealed housings and accelerate fatigue in metal components. Freeze-thaw cycles can force moisture into micro-cracks, where it expands and widens existing weaknesses.
Tropical and high-humidity environments combine heat, moisture and biological agents, fungal growth on equipment surfaces and in electrical systems being a particular concern, creating conditions that degrade both materials and coatings rapidly.
MIL-STD-810, the US military environmental testing standard, addresses this range directly, covering salt fog, humidity, sand and dust exposure, temperature shock, fungus and freezing rain as standard test conditions for equipment designed for military use. UK defence procurement operates within the DEF STAN framework, which sets equivalent environmental and material standards for British military equipment and its suppliers.
Understanding the Types of Corrosion That Affect Military Assets
Not all corrosion is the same, and effective protection requires understanding which types are most likely in a given environment.
Uniform or surface corrosion is the most visible form, general oxidation of an exposed metal surface. In painted or coated military equipment, it typically begins where coatings are breached: at scratches, edge joints or areas of mechanical wear.
Pitting corrosion is localised and far more structurally dangerous than its small surface appearance suggests. Chloride ions from saltwater or airborne salt penetrate the passive oxide layer on metals such as stainless steel and aluminium, creating deep, narrow pits that weaken the material from the inside. This is a significant concern for naval and coastal applications.
Galvanic corrosion occurs where two dissimilar metals are in electrical contact in the presence of an electrolyte. In a galvanic couple, the more active metal corrodes at an accelerated rate, zinc, for example, is often used as a sacrificial anode for steel structures to exploit this principle deliberately. In defence equipment where multiple materials are combined, aluminium structures fastened with steel fixings, for instance managing galvanic interactions is a genuine engineering consideration.
Corrosion fatigue is the degradation of a material under the combined effect of corrosion and cyclic loading the environment plays a significant role in the fatigue behaviour of high-strength structural materials like steel, aluminium alloys and titanium alloys. For equipment subject to vibration, repeated mechanical stress and exposure to corrosive environments simultaneously, a category that covers a wide range of military vehicles and weapon systems, this is a particularly important failure mode
The Role of Protective Covers in Defence Corrosion Prevention
Physical protective covers represent one of the most practical and cost-effective interventions available for defence assets in storage, transit or standby configurations. Even the most rugged equipment deteriorates when exposed to the elements, putting readiness at risk and increasing maintenance costs, and protective covers with the right properties are a proven and cost-effective line of defence against mould, mildew and corrosion.
Material selection in a protective cover matters as much as in the equipment it protects. A fully waterproof but non-breathable cover traps moisture against the asset, creating a humid microenvironment that can accelerate corrosion more rapidly than leaving the equipment uncovered. Air-permeability in cover fabrics is critical, it prevents the greenhouse effect that can actually accelerate corrosion. The correct specification is a breathable, weather-resistant fabric that allows moisture vapour to escape while preventing ingress of rain, salt spray, dust and contaminants.
For longer-term storage applications, covers can also be specified with Volatile Corrosion Inhibitor (VCI) integration, advanced protection options including VCI provide long-term anti-corrosion protection for sensitive components during storage.
The fit of the cover matters operationally as well as protectively. In defence environments, covers need to be deployed and removed quickly, often by personnel working under pressure and in difficult conditions. A cover that requires significant time or expertise to fit is a cover that doesn’t get fitted consistently, defeating the purpose entirely. Properly designed military protective covers should allow for rapid, straightforward deployment.
How Specialised Covers Supports Defence Applications
At Specialised Covers, we manufacture bespoke protective covers for defence applications from our UK facility, producing solutions designed specifically for the asset, the environment and the operational requirement.
Every cover we make for defence applications begins with understanding the specific protection challenge: the environment the equipment will be stored or transported in, the access requirements during use, the material specification appropriate for the conditions, and any relevant standards the cover needs to meet. There is no standard template, the cover is engineered for the application.
Our in-house design capability, including Proliner digital scanning for precision pattern generation, means we can produce covers for complex, irregular or classified asset profiles with accuracy that hand measurement alone cannot guarantee. All covers are manufactured in the UK, with full control over the production process and the quality of the finished product.
For defence procurement teams and contractors looking to address corrosion risk across vehicle fleets, stored equipment, weapon systems or specialist assets, the starting point is a conversation about the specific requirement. We are experienced in working within defence supply chains and in producing to the standards and documentation requirements that defence contracts demand.
To discuss a defence cover requirement or request further information, use the enquiry form below or contact our team directly.
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