Why we use Black Chrome on Robotic Soldering Tips

Leisto produces black chrome soldering tip for all kinds of soldering robots, as well as customization and OEM.

In the market, there are soldering tips with black chrome plating and white chrome plating. The usage life of them is the different but when the tip is used on the soldering robot, the difference is obvious.

Black chrome electroplate was firstly developed in 1953. Bright chromium-base electro deposit was developed that can be applied at a high rate of deposition. The electrolyte contains chromic acid and nickel chloride plus a carboxylic acid. When this bright deposit is treated with hydrochloric acid (for a few seconds) a black finish results. This finish is non-smudging, very adherent and uniform. These deposits will withstand heating in high vacuum to temperatures of more than 930°F (500°C) and can be applied to most metals without the use of special equipment.

Generally, soldering tip consists of copper base, iron plating layer, nickel plating layer and chrome plating layer. Black chrome attaches best to nickel, which adheres best to copper; however, the key working layer and the one that affects tip life the most is the layer of iron.

The standard tip (general plating) has more oxidation and will burn flux residue buildup on the tip and shaft. Over time, it resulted in a minor decline of soldering operations even when tip maintenance was properly addressed. By contrast, the black chrome tip performs in maintaining higher quality soldering.

Another benefit of the black chrome tip is that the reduction of wettable area on the tip surface naturally directs the solder more towards the joint area, thus reducing the overall migration of solder up the tip.

Because most of the black chrome tip’s shaft was plated, the solder traveled only to the source side of the board upon contact, increasing the accuracy of the amount of solder being dispensed into every solder joint. In addition, the activated flux did not accumulate as much on the black chrome tip, since the solder was only allowed to localize at the end of the tip. As a result, smaller amounts of activated flux were left behind.

Comparing with the white chrome plating tip, black chrome soldering tip can reduce the rate of fault soldering on robotic soldering.

soldering tip

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