Metal Rust During Storage: Causes, Impacts, and Solutions for Manufacturing Businesses

Metal rust is a common issue during storage and transportation, especially in environments with high humidity and oxygen. For many manufacturing and logistics companies, this problem is often not monitored as a separate operational indicator and is usually recorded only after corrective actions are required. The content below explains the factors that cause rust in storage environments, the impact on business operations, and how advanced technologies are being applied to control corrosion under real usage conditions.

1. How does metal rust form during storage?

Rust is the result of a chemical reaction between metal, oxygen, and moisture. In storage environments, this process continues constantly if basic conditions are not properly controlled.

In tropical and humid climates such as Vietnam, air humidity and time of wetness (TOW) are key factors that accelerate metal corrosion. Research conducted in the coastal area of Do Son (Hai Phong) shows that when relative humidity is high (RH > 80%) and TOW is prolonged, the corrosion rate of carbon steel increases significantly during more humid months. This clearly demonstrates the strong relationship between tropical humidity conditions and the rate of metal rust under real-world conditions.

High humidity accelerates metal corrosion, metal rust, Mekonglink — High humidity accelerates metal corrosion

In addition to humidity, temperature fluctuations in warehouses also contribute to moisture condensation on metal surfaces, especially for products stored for long periods or with insufficient sealing.

Long storage time and slow inventory turnover increase the duration that metal is exposed to corrosive environments. In many cases, rust does not appear immediately but accumulates gradually over time. Finally, packaging materials that are not designed to control moisture or oxygen reduce the level of protection for metal during storage.

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2. The impact of metal rust on business operations across industries

2.1 Tarnishing reduces the value of jewelry

In the jewelry industry, product value lies not only in the material but also in its appearance when delivered to customers. However, silver and alloys such as brass are highly prone to tarnishing during storage or transportation, especially when exposed to humidity, oxygen, and sulfur compounds in the air.

Tarnishing causes metal surfaces to turn gray, black, or green, even though the material structure remains intact. For jewelry, even a slight color change can make the product unsuitable for display or sale. As a result, businesses must polish, clean, or reprocess the products, leading to additional labor costs, time consumption, and the risk of delayed product launches – especially for items stored long-term or transported through multiple climate zones.

Tarnishing reduces the value of jewelry, metal rust, Mekonglink — Tarnishing reduces the value of jewelry.

2.2 Metal component degradation during storage affects furniture products

In the furniture and decoration industry, many metal components, such as brass lamps, steel or stainless-steel handles and pulls, metal chair and table frames, or nickel- and copper-plated accessories, are not the main structural parts, but they directly affect perceived quality and product finish.

When stored or transported under high-humidity conditions, metal surfaces may experience light oxidation, discoloration, or small corrosion spots. While these issues usually do not damage the structure, they prevent products from meeting finishing standards – especially for export orders or high-end projects.

From an operational perspective, rust increases the rate of products that require reinspection, cleaning, or rework before delivery. These costs are often not included in production planning, but over time, they directly impact profit margins and delivery schedules.

Metal component degradation during storage affects furniture products, metal rust, Mekonglink — Metal component degradation during storage affects furniture products.

2.3 Rust creates additional costs and supply chain disruptions in automotive mechanical parts manufacturing

In automotive mechanical parts manufacturing, metal components often go through intermediate storage and long transportation periods before assembly or delivery to partners. When rust or surface corrosion occurs, components cannot be used directly in production and must be cleaned, reinspected, or even replaced.

This not only generates direct costs but also disrupts production lines and affects delivery schedules and partner commitments. At an industry-wide level, the impact is no longer local. According to a Frost & Sullivan (2024) report, corrosion-related costs in the global automotive industry are estimated at approximately USD 13.5 billion per year, including repair, maintenance, and replacement of affected metal parts during production, storage, and transportation. This data shows that metal rust is not just a technical issue but a significant risk factor for operational efficiency and supply chain stability in the automotive industry.

The combined impacts above show that metal rust is not an isolated technical problem. It directly affects costs, timelines, and overall operational efficiency. When corrosion-related costs are scattered and difficult to track, businesses tend to underestimate their real impact. This highlights the need to rethink rust control in storage – from reactive handling to a more proactive and systematic approach.

Metal rust causes additional costs and supply chain disruptions in the manufacturing of automotive mechanical parts, Mekonglink — Rust causes additional costs and supply chain disruptions in the manufacturing of automotive mechanical parts.

3. High-quality VCI solutions from Korea: a foundation for flexible rust control

High-quality VCI solutions from Korea are widely used in industrial environments thanks to their stability and adaptability to real operating conditions. Key strengths include:

High standards and Korean origin

A Korean brand develops VCI with many years of experience in materials and corrosion control.
The manufacturer is a technical cooperation partner of Hyundai Automobile Korea, reflecting its ability to meet strict industrial requirements.

Stable quality for industrial storage environments

Designed for use in high-humidity storage and transportation conditions.
Suitable for many types of metals and product shapes.

Customizable to usage needs

Can be adjusted based on customer needs across different industry segments.
Flexible for both short-term and long-term storage.
Adaptable to various packaging methods and storage spaces.

Flexible implementation with reasonable cost

Suitable for small, medium, and large enterprises.
Helps balance rust control requirements with cost efficiency.

This approach allows businesses to view VCI as part of a rust risk management strategy in storage, rather than a solution used only after problems occur.

4. VCI applications in storage: approaches and common deployment forms

Based on the quality foundation and customization capability above, VCI can be applied in various forms in real storage and transportation scenarios, depending on each company’s specific conditions.

VCI Powder

Commonly used in enclosed spaces such as tanks, pipelines, drums, or containers
Can be placed directly in the protected space or mixed with water to create a spray solution
Suitable for protecting internal metal surfaces in enclosed chambers or equipment
Ideal for protecting small metal parts during transportation and storage
The general mechanism of VCI works by creating an environment that limits corrosion around metal surfaces

VCI Film

Packaging material with integrated corrosion inhibitors
Provides long-term protection for automotive parts, machinery, and exported metal products
Used to wrap components, semi-finished goods, or pallets
When packaged, VCI film maintains a stable micro-environment throughout storage and transportation
Suitable for medium- and long-term storage, especially when packaging multiple products together

VCI Masterbatch

Concentrated VCI product used to create protective films and sheets
Applied in packaging production to create corrosion-control packaging materials
Enables businesses to standardize packaging based on specific requirements
Typically suitable for companies with large volumes and consistent packaging needs

In practice, selecting the right VCI form should not be based on a single technical criterion. Businesses need to consider storage duration, product shape, packaging tightness, and existing operating processes together to make the right decision.

VCI applications in storage: approaches and common deployment forms, metal rust, Mekonglink — VCI applications in storage: approaches and common deployment forms.

Is your business facing metal rust issues during storage or transportation? Contact Mekonglink directly for consultation and VCI solutions tailored to your actual usage needs.

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