Tin Plate – (19,20,20a,38): Depending on the thickness/application specified by the customer. Tinplate can be utilized for articles to be soldered; to prevent galling; to prevent corrosion or to prevent the formation of a case during nitriding.

COPPER

Silver Plate Finish – (10): Semi-bright in appearance. Good corrosion resistance depending on the base metal. Will tarnish easily. Solderability is excellent but decreases with age. For articles such as terminals which are to be soldered. Also used on copper to enhance electrical Conductivity.

STAINLESS STEEL

Passivate – (12,12a): A process designed to remove foreign metals from the surface of stainless steel and corrosion resistant steels and to prevent natural tendency of the surface to oxidize.

Zinc Plate – (31,31a,31b,31d,31e): Electrodeposited zinc coatings applied to brass, steel, and stainless steel articles provides protection from corrosion. Service lift of zinc coating is a function of its thickness and the type of environment to which it is exposed. Bright or dull finish acceptable.

(27): Known as industrial or hard chromium; provides wear and abrasion resistance and incidental corrosion protection of parts as the specified thickness of the plating may afford.

Zinc Plate – (31,31a,31b,31d,31e): Electrodeposited zinc coatings applied to iron, steel, stainless steel and brass articles provides protection from corrosion. The service life of zinc coating is a function of its thickness and the type of environment to which it is exposed. Bright or dull finish is acceptable.

Black Phosphate – (34): Provides corrosion resistance; also acts as a lubricant. (28): Engineering chromium is usually applied directly to base metal and is finished by grinding to the specific dimensions.

Black Oxide – (11, I1a): Black oxide coatings; with or without supplementary preservative treatment, are used when a black surface is required, Limited corrosion protection under mildly corrosive conditions, for decorative purposes or decrease in light reflection.

Zinc Plate – (31,31a,31b,31d): Electrodeposited zinc coatings applied to iron or stainless steel, and brass articles provide protection from corrosion. The service life of zinc coating is a function of its thickness and the type of environment to which it is exposed. Bright or dull finish is acceptable.

Black Phosphate – (34): Provides corrosion resistance; also acts as a lubricant. (28): Engineering chromium is usually applied directly to base metal and is finished by grinding to the specified dimensions.