Metal stamping processes, vital in various industries, face a common adversary – corrosion. The susceptibility of components to corrosion stems from alterations in the metal crystalline phase induced by external forces. In this article, we delve into strategic approaches to tackle corrosion, emphasizing the role of different materials and treatments.
Unveiling the Corrosion Challenge
Corrosion initiates when external forces alter the crystalline phase of metal stamping components. This transformation triggers modifications in internal metal stresses, making specific regions prone to corrosion. To combat this, the go-to strategy involves employing thermal treatment methodologies to modify the crystalline phase and equalize stresses. This not only curtails corrosion but also acts preventatively against deformation of stamped components.
Galvanized Sheet Metal: A Robust Shield
Galvanized sheet metal emerges as a noteworthy contender in the realm of anti-corrosion materials for metal stamping. Its effectiveness lies in two key aspects. Firstly, it forms a dense zinc carbonate alkaline film in corrosive environments, acting as a formidable barrier against further corrosion. Secondly, through cathodic protection, even if the zinc coating is compromised, exposing the base material, zinc sacrificially shields the substrate due to its lower potential compared to iron.
Stainless Steel: Inherent Corrosion Resistance
Stainless steel, a prevalent choice in metal stamping, boasts inherent corrosion resistance. While all metals react with atmospheric oxygen, stainless steel takes a different route. The primary alloying element, chromium (Cr), demonstrates high chemical stability, creating an extremely thin, robust, and stable chromium-rich oxide film on the steel surface. This film obstructs oxygen atom infiltration, thwarting continuous oxidation and providing lasting corrosion resistance.
Tinplate: A Barrier Against Rust
Known as tinplate, this material features an iron sheet with a tin coating, primarily relying on barrier protection. The tin reacts with oxygen, forming an oxide film that retards the rusting and corrosion process, ensuring longevity and durability in metal stamping applications.
Aluminum Alloy Sheets: Preserving Through Oxide
Aluminum alloy sheets leverage barrier protection for internal preservation. While aluminum and its alloys are highly reactive, forming a thin oxide film in the atmosphere, anodizing treatment is often applied in the metal stamping process. This treatment ensures a sufficiently dense oxide film, enhancing barrier protection and extending the lifespan of aluminum components.
In conclusion, the arsenal of anti-corrosion materials for metal stamping includes galvanized sheet metal, stainless steel, tinplate, and aluminum alloy sheets. Understanding their unique properties and applications empowers industries to make informed choices, ensuring durability and performance in the face of corrosion challenges.