Pickling

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Pickling

Definition and Function

Pickling is a chemical surface treatment that uses acid solutions to remove oxide scales, rust, and impurities from metal surfaces. Through the chemical reaction between acid and oxides, the process restores a clean, smooth metallic surface, preparing it for subsequent treatments such as passivation, electropolishing, or painting. Its main function is to clean and activate the surface, improving adhesion and corrosion resistance in later stages.

Colors

Gold

Silver

Gray

After pickling, the surface exhibits a uniform metallic appearance, usually silver-gray or matte. The gloss is low, with fine etching marks that provide a good bonding surface for subsequent coatings or treatments.

Example of a bead-milled + anodized colored part

Technical Properties

Surface Condition	Surface Roughness	Adhesion	Corrosion	Typical Acid Solutions	Typical Applications
clean, uniform, free of oxide scale and rust	slightly increased, enhancing surface activation	improved coating-to-substrate bonding	enhanced when combined with passivation or coating	nitric-hydrofluoric acid (for stainless steel), hydrochloric or sulfuric acid (for carbon steel)	stainless steel tanks, piping, weldments, and precision mechanical components

Applicable Materials

Metals: Aluminum Stainless Steel Brass Copper Titanium Mild Steel Alloy Steel Tool Steel Spring Steel

Process Characteristics

Removes oxide layers, rust, and heat-tint discoloration via controlled acid reactions;

Suitable for stainless steel, carbon steel, and aluminum alloys;

Often followed by passivation to enhance corrosion resistance;

Requires careful control of acid concentration, temperature, and duration to prevent over-etching;

Can be performed by immersion, spraying, or acid circulation methods.