The hydrogen which is expelled from solution tends tocombine with cuprous oxide levels are very low after deoxidation, hydrogenmay still be problematic and it is preferable to reduce it to negligibleproportions. The easiest and most effective way of doing this is to bubblethrough the melt a stream of hydrogen scavenging gas which does not reactwith the alloy treated.

ECO – LOWGAS units comprise a mixture of chemicals which, on contact withthe molten metal, decompose to give a continous steady stream of non-reactivegas. Since ECO – LOWGAS is very carefully dried and packed, the gas bubblescontain very little hydrogen and are able to flush out that gas and carry it to thesurface where it is lost to atmosphere.

INSTRUCTIONS FOR USE:-

a) Melt down under the cover of an approximate flux like ECO – Cupreet,ECO – Cuprex and ECO – ALBROL

b) For degassing, Plunge the ECO – LOWGAS units to bottom of the melt.Maintain this position till the bubbling effect subsides totally. This wouldensure maximum contact time between evolved gas bubbles and melt andobtain good hydrogen removal.

c) The degassing time should be at least 3 minutes. This is accompanied bya loss in temperature of 10-15 centigrade degrees. A correspondinglyhigher degree of superheat must therefore be allowed.

d) The metal should be deoxidised using ECO-DS tubes, skimmed andpouring immediately.

BENEFITS:-

1) ECO – LOWGAS is an inexpensive, easy to apply and efficient method ofremoving hydrogen from copper and copper based alloys.
2) Removal of hydrogen by ECO – LOWGAS improves the mechanicalproperties in castings, minimizing porosity due to steam reaction.
3) Ancillary equipment required to use ECO – LOWGAS is simple and costsvery little.
4) Metal fluidity is improved due to degassing followed by deoxidation.
5) ECO – LOWGAS is robust, stores well and is safe and non-toxic in use.

ECO – LOWGAS is available in two grades:

1) ECO – LOWGAS 1A no for 50 kg melt.
2) ECO – LOWGAS 2B no for 100 kg melt