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Black Oxide

Black oxide is a conversion coating that causes virtually no dimensional change. It provides a deep black color and excellent corrosion resistance when used in conjunction with the proper post dips.

Our black oxiding services are designed to accommodate both high volume and small production runs. This provides a flexibility of production requirements while maintaining a strict adhearance to all specifications.


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Electroless Nickel

Electroless nickel is hard, uniform, and corrosion resistant. As deposited, the hardness is about 45-50 Rc. The electroless nickel can be baked to a hardness of approximately 60 Rc. The deposit has excellent wear resistance and often allows its use as a replacement of high alloy materials and hard chrome.

EN requires no electrical current and the result is a very uniform coating. Blind holes, threads, channel recesses or internal areas receive the same amount of plating as sharp corners, edges or flat surfaces.

MIL SPEC: MIL-C26074, AMS 2404

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Citric Acid Passivating of Stainless Steel

Passivating is the process of removing contaminants and free iron from the surface of stainless steel. Removing free iron enriches chromium oxide on surface which is a more passive layer.

Our Citric Acid Passivating Meets the Following Standards

• ASTM = A – 967 • AMS = 2700B

AMS QQ – P – 35C was cancelled by the Defense Department in favor of ASTM Standard for passivation A – 967. Also cancelled by Aerospace Materials Division, SAE, as of February 2005, and superceeded by AMS 2700.

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Barrel Plating

L&L’s economical barrel plating services are well-suited for manufactured parts that demand specific finishing requirements. We are equipped with barrel plating lines to offer high-quality barrel plating solutions.

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