The LE 2000 new-formulation high-performance electrolyte for anodic treatment in cleaning and electrochemical deburring of austenitic, ferritic and fusion steels. The LE 2000 should be used in acid- resistant plastic tanks or steel tanks with internal cladding of plastic or lead flashing material.
The current source should be constituted by a rectifier with continuous voltage adjustment up to 15 V.
Field of use
Coarse irregularities such as scratching, streaking or coarse burrs cannot be eliminated with this treatment. In these cases it is necessary to perform a mechanical pre-cleaning.
Furthermore the homogeneity of the alloy and its structural fineness play a very important part in the metal’s attitude to electrochemical polishing.
LE 2000 is constituted by an acid mixture with additives. Consequently the safety rules concerning the use of acids (protective aprons, goggles, etc.) must be respected.
The water used to wash the pieces is acid and contains metal ions originating from the dissolved metal. Chrome is present in its trivalent form. Follow local rules relating to evacuation of treatment water.
Operating instructions suspension tools and cathodes
The suspension tools must be made of copper clad with a plastic material or titanium. Titanium is not subject to attack in the polishing bath. For the contact points, copper, brass and titanium can be used. Copper and brass contacts must be demountable as they are attached to the electrolyte. The pieces to be treated must be fixed and distanced from one another by at least 30 mm.
Cr/Ni/Mo stainless steel can, for example, be used for the cathodes. The distance between pieces and cathodes must be about 10 - 15 cm.
For hollow pieces use auxiliary cathodes.
Preparation of pieces
The pieces to be treated in the LE 2000 electrolyte must be cleaned and degreased using FS 10 or other equivalent products, dried and free of grease and calamines. If necessary, degrease and pickle using OR 18 pickling liquid, ECOINOX Liq. pickling liquid or GELINOX pickling liquid for welding (request the specific instructions).
Polishing and deburring
The optimal current density for polishing and deburring is situated in a range of between 5 and 15 Amp./dmq. maximum. A density of 10 A/dmq is sufficient in the majority of cases.
To prevent formation of streaking and accumulation of gas bubbles, mount the piece and bath shaker devices.
Entry and exit of the pieces to and from the bath are done after the current to the tank has been switched off. Working temperature must be maintained between 45 and 80° C according to the pieces under treatment. Removal: 13 - 15 micron for 100 Amin/dmq
For example, for a 1 dmq 240 grain steel-brushed piece with a damaged surface layer of only 10 micron, working conditions will be as follows: LE 2000 70 Amin/dmq = 15 A /dmq for 4.5 minutes
If for example a piece of 123 dmq is to be electro-cleaned with the same amount of removal as above the following parameters should be used: LE 20001845 A for 4.5 minutes
Treatment following polishing
When removed from the bath the polished pieces should be rinsed in running water and then spray-washed. A better alternative is a 10-15% DESMUT or ECOCLEAN2000 treatment for removing deposits and marks on the electro-cleaned surface.
For pieces with complex shapes there should also be an alkaline neutralisation such as NEUTRAL2000 and then a further wash.
Usual drying methods in the field of electroplating (centrifuge, dewatering liquids, etc.) can be used.
Electrolyte consumption - dragging
Average consumption of electrolyte is around 5 Kg. per 1000 Ah. This consumption is to be considered as the quantity to be topped-up in order to maintain the electrolyte in conditions of perfect efficiency, while taking care not to exceed the Iron and density limits indicated.
Our laboratory is constantly at your disposal for calculation of the exact consumption in any single situation. When the Iron content is insufficient, the electrolyte either does not work or works imperfectly.
During work compensate losses due to dragging by adding electrolyte.
It is advised to work in a way that electrolyte consumption corresponds to dragging losses.
On completion of work remove the cathodes from the bath and clean them in running water. If the deposit that has formed on the cathodes is not immediately dissolved, leave the cathodes in water for a few hours. Clean the bath of sludges formed at the bottom of the tank when a few centimetres thick or install one of our special filters.
When there are long period of non-use, scrupulously cover (and seal) the tank as the bath is hygroscopic and therefore absorbs moisture from the air.
Regeneration of the le 2000 electrolyte
As with other electrolytes the polishing performance is slightly reduced when the dissolved iron reaches the value of 3.5%. To keep the clean conditions constant, it is recommended, once the maximum of Iron has been reached (3.5), to periodically remove a part of the bath so that it falls to a 3.2% content, and resume work up to restore the bath to the 3.5% content.
The maximum iron content is however 5%: above these values there will be a significant reduction in polishing and a relevant increase in working times.
To calculate the Iron proceed either with titration using Potassium Permanganate or with the Merck colorimetric kit.
LE 2000 is available in the following formats:
- Electrolyte LE 2000 in 30 kg. packs. (PC00040)
- Electrolyte LE 2000 in 1500 kg. packs. (PC00042)