Why do knives made of industrial steel change color?
Industrial grade steel is popular in knife making because of its durability, corrosion resistance, and ease of maintenance. It is known for its ability to resist stains and discoloration. However, it is not uncommon for industrial steel knives to change color over time. This phenomenon can be confusing to knife owners, but understanding its causes can help alleviate some of the frustration. Let's examine why knives made of industrial steel can change color and what factors contribute to this transformation.
Oxidation
One of the main causes of discoloration of industrial steel knives is oxidation. When industrial steel interacts with oxygen, a thin protective layer called "passive layer" is formed on the surface. This layer consists mainly of chromium oxide, which acts as a shield against corrosion and rust. However, under certain conditions, this passive layer can be damaged, allowing oxygen to penetrate to the surface. This can cause the steel to oxidize, causing discoloration.
Effects of heat on knives
Due to high heat, the color of industrial steel blades can change. When stainless steel is exposed to higher temperatures, the surface layer may be referred to as "temperature painting". As a result, the steel creates a rainbow effect with colors ranging from pale yellow to blue and purple. The specific colors depend on the temperature reached during the heating process. Although temperature staining is an aesthetic change and does not affect the performance of the knife, it is a natural consequence of heat exposure.
Chemical reactions
Certain foods and cleaning agents can cause chemical reactions with the surface of industrial steel, causing discoloration. Acidic ingredients such as citrus fruits, vinegar or tomatoes can cause a reaction that causes staining or slight discoloration of the blade. Similarly, prolonged exposure to highly alkaline materials can affect the appearance of steel. Also, some cleaning products contain chemicals that can react with industrial steel, causing discoloration. It is important to use mild cleaning agents specially formulated for industrial steel to minimize the risk of chemical reactions.
Carbon content in knives
Industrial steel is an alloy composed mainly of iron, chromium and carbon, among other elements. The carbon content of steel can affect its color. Knives with more carbon can be darker or grayer, while those with less carbon have a brighter, silvery color. This difference in carbon content contributes to the different aesthetics of stainless steel knives.
Finishing of the surface of the knives
The type of surface finish of industrial steel knives can also affect their color. Different finishes such as satin, mirror polish or brushed can change the way light interacts with the steel surface, resulting in a change in the color spectrum. Finishing can create visual effects and enhance the overall appearance of the knife, thus increasing its uniqueness.
It is important to note that color changes in industrial steel knives are usually superficial and do not affect their functionality or performance. However, if the discoloration is accompanied by rust or pitting, it may indicate more serious corrosion problems that need attention.
Proper maintenance is necessary to maintain the appearance and condition of industrial steel knives. Regular cleaning, quick drying after use and avoiding harsh chemicals or extreme conditions can help reduce discoloration and preserve the original shine of the knife.
In summary, industrial steel blade discoloration is a natural phenomenon that is influenced by oxidation, heat exposure, chemical reactions, carbon content, and surface finish. By understanding these factors, knife owners can accept the unique changes in their industrial steel blades and take appropriate measures to keep them in optimal condition. With proper care, industrial steel knives can continue to serve as reliable companions, showing off their character with changing colors.
