Traditional black oxide processes are making a comeback. In some applications, according to HMS Höllmüller, classic black oxide process are being reinstalled to improve process reliability.  
 
The HMS ComTech process equipment has a titanium module that can run at higher temperatures associated with the oxide treatment step. According to HMS Höllmüller, higher operating temperatures combined with a unique solution application mechanism and special flooding system results in a homogeneous surface treatment and uniform oxide development with improved bonding characteristics.
 
The HMS Black Oxide equipment can provide a scratch-proof surface with reduced “pink-ring effect.” The uniform oxide surface is easy to inspect. For the circuit-board manufacturer, this means considerably fewer rejects and better subsequent processing.