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When there is no longer a change response and the first cell is still in triggered condition, the second component (eg, HCl) is added The logic continues to flip-flop until the first cell is satisfied The etch sump conditions seem to have a partially delayed response to the chemical addition reaction such that oxidizing seems to occur over a longer period Therefore, proper addition and mixing in the sump must be considered for stable control operation 1 Safety Sodium chlorate is a potent oxidizing agent that can support combustion It is necessary to ensure that solution spills are completely cleaned up and that the rags or other materials are not allowed to dry out Excess addition of reagents above amounts to support the actual copper etched may form chlorine gas that will be liberated into the etch machine and environment.

audience, the written word can act like a magnet, and your eyes will irresistibly go to the cards. This eliminates any chance for you to look or sound natural. Fewer cards can help the verbal and visual ow to stay smooth. As you become more experienced, you ll quickly learn how many cards, containing how much information, work for you. This number varies from person to person.

Proper instrumentation and training for this eventuality must be implemented 2 Solution control If there is insufficient free acid content in the etch sump to react with the oxidizer and copper (Eq 348), a dangerous imbalance can occur First, the instruments and controls may not respond properly, and the etch reaction may slow down Second, any subsequent addition of acid or mixing with acid-containing wastes can liberate chlorine gas in an uncontrolled and dangerous manner Proper chemical balance is another issue Water is added in all of the chemical streams and is produced in the chemical reaction Therefore, any excess chemical addition can dilute the chemistry and change the copper-holding ability of the etchant Hydrogen Peroxide Regeneration Hydrogen peroxide uses a two-part chemistry much like sodium chlorate ORP instrumentation is identical in the control of adding proportional amounts of oxidizer and hydrochloric acid.

Peroxide tends to decompose on sitting so that the spills are not as dangerous Older application of colorimetric cells for the control of dosing has largely been eliminated 1 Safety Hydrogen peroxide solutions can become unstable and disassociate into oxygen and water with the liberation of heatThis can occur with explosive force in a confined vessel such as a drum stored in sunlight or heat It can also occur in plumbing with closed valving..

The decomposition is catalyzed by many metals, including Cu, Ni, and Fe. If traces of metal or metal salts are allowed to contaminate piping runs, the piping may also rupture explosively. Facilities should be constructed with pressure relief capabilities. Electrolytic Regeneration. The electrochemical reversal of the etching of copper shown in Eq. 34.9 and 34.10 is claimed to be effective and economical. Descriptions of this system are given in the literature.15 On a large scale, electrolytic regeneration requires a high investment in equipment and materials, as well as high power consumption. The chemical formulation is relatively high in acid content and low in copper, a condition not optimized for etching effectiveness or plating efficiency. The etchant is a solution of cupric chloride and hydrochloric acid (Table 34.1, no. 1). Etchant flows continuously between spray-etching machines and a plating tank. In the plating machine, two processes take place simultaneously: copper is plated at the cathode, and regeneration of the spent etchant occurs at the anodes. Copper recovery may not return copper value and may be expensive, inconvenient, and cause difficulty with recycling. 34.4.2.4 Problems with Cupric Chloride Systems

1 Slow etch rate Depending on chemical formulation, cupric chloride is inherently slower than ammonia and must be properly evaluated before production expectations are established Check to ensure no resist residues or chromate coatings remain on the panel surface before etching A slower than usual rate is frequently due to low temperatures, insufficient sump mixing, or poor solution chemical control If temperature and agitation are under control, slow etching with a dark green solution may result from a low cupric ion content, indicating insufficient oxidizer Acid must also be added to clarify cloudy solutions (Before acid addition, make sure excess oxidizer is not present) In regenerative systems, the source of oxidation may be depleted It is advisable to analyze specific gravity, free acid, and total chloride on a regular schedule and maintain control charts to ensure that bath controllers are consistent and operating properly 2 Sludging.