AURALL 305M Electrolytic Gold For Electronic Finishing Applications

Transcription

1 Technical Data Sheet AURALL 305M Electrolytic Gold For Electronic Finishing Applications Regional Product Availability Description Advantages North America AURALL 305M Electrolytic Gold produces semibright, ultra-pure 24-karat, ductile deposits. AURALL 305M Electrolytic Gold is used to plate semiconductor components, ceramic packages, multilead headers, or lids in rack and barrel operations, with reduction of gold losses normally attributed to overplating or excessive use of "shot" required to achieve minimum thicknesses in low current density areas. Barrel efficiency and uniformity of deposition are excellent, even when plating loosely packed, poorly tumbling loads. AURALL 305M Electrolytic Gold meets the requirements of Mil Spec. G45204C, Type III, Grade A. Outstanding throwing power Excellent deposit uniformly over complicated shapes Excellent ability to alloy, bond and solder Deposit Properties Purity: 99.9+% Density: 19.2 g/cc at 25 C Hardness Range: Knoop Bath Make-up Make-up Procedure Chemicals Required Metric (U.S.) AURALL Make-up Solution 75% ml/l (75% v/v) AURALL 305M-1 Additive 55 ml/l (5.5% v/v) Gold Metal as 8 g/l (1.0 toz./gal.) Potassium Gold Cyanide AURALL 305M-1 PGC Replenisher 200 ml/tr. oz. gold metal as PGC 9 ml ml/tr. oz. gold metal as PGC 5 ml per each Liter of 305M-1 Additive used above Distilled or D.I. water (warm) to final volume 1) Add AURALL Make-up Solution to a clean tank. 2) Add AURALL 305M-1 Additive. Mix thoroughly. 3) Distilled or D.I. water should then be added to bring level of plating tank up to approximately 90% of final volume. Heat solution to 48 C (118 F). 4) Dissolve Potassium Gold Cyanide separately in warm distilled or D.I. water and add to the above. 5) Add AURALL 305M-1 PGC Replenisher. Mix thoroughly. 6) Add and mix. Page 1 of 5 AURALL 305M Electrolytic Gold / Interconnect Technologies March 2016

2 Make-up Procedure (cont d) Bath Operation Metric 7) Dilute to final volume with distilled or D.I. water. 8) Mix thoroughly. 9) Check ph and specific gravity and adjust if necessary. Parameters Range Optimum Gold Content 6 12 g/l 8.0 g/l * ml/l 60 ml/l Temperature** C 55 C Current Density 0 2 A/dm 2 Rack continuous wire/strip Barrel 0.4 A/dm 2 Specific Gravity at 20 C ph electrometric 7.0 Agitation Desirable, solution or mechanical Deposition Rate gm per ampere minute at optimum conditions Plating Rate 2.5 microns in 20 minutes at 2 A/dm 2 Bath Operation U.S. Parameters Range Optimum Gold Content toz./gal. 1.0 toz./gal. * 4 8% 4% minimum Temperature** F 130 C Current Density 0 20 A/ft 2 Rack continuous wire/strip Barrel 0.4 A/ft 2 Specific Gravity at 20 C Baumé 18 Baumé ph electrometric 7.0 Agitation Desirable, solution or mechanical Deposition Rate 1 per toz.gold metal per 283 amp/min. at optimum conditions Plating Rate 100 microinches in 20 minutes at 2 A/ft 2 *Note: As the AURALL 305M Solution ages, there is a natural tendency for a gradual color change from near water white to amber. During this period, it is recommended that stabilizer concentration be increased accordingly, up to a maximum of 80 ml/l (8.0% v/v). **Note: Lower temperatures will generally produce brighter deposits as well as reduce the amount of gold immersion on hybrid packages. Bath Maintenance Potassium Gold Cyanide Gold metal is replenished by additions of Potassium Gold Cyanide. Replenishment is based upon analytical testing of gold metal concentration or on an amp minute schedule confirmed by analysis. Add 1 troy ounce of gold metal every amp minutes dependent upon cathode efficiency. Page 2 of 5 AURALL 305M Electrolytic Gold / Interconnect Technologies March 2016

3 Bath Maintenance (cont d) Replenishment per Every Troy Oz of Gold Added Aurall 305M-1 PGC Replenisher: 200 ml : 9 ml If deposits have become red or brown in appearance, up to 2.5 ml/l (0.25% v/v) of Pure Gold Brightener may be added. This may particularly be required after idle periods. AURALL Acid Salt ph should be measured daily and maintained in the recommended range. Solution ph is lowered by additions of AURALL Acid Salt. Add 2.4 g/l (0.15% v/v) AURALL Acid Salt to lower ph by 0.1 unit. Solution ph is raised by additions of potassium hydroxide. Add 1.5 g/l (0.0.5% v/v) potassium hydroxide to raise ph by 0.1 unit. AURALL Conductivity Salts Specific gravity should be measured daily and maintained in the recommended range by additions of AURALL Conductivity Salts. Ten (10.0) g/l AURALL Conductivity Salts will raise the specific gravity by Stabilizer concentration should be measured twice weekly and maintained in the recommended range by additions of. See analytical procedure for. Ten (10.0) ml/l will raise concentration by 1.0%. AURALL 305M-1 Additive Supplementary additions of AURALL 305M-1 Additive are not usually required. If deposits become too bright, or a loss in thickness distribution is observed; 10 ml/l of AURALL Additive may be added. Determination of I. Applicable Products a) AURALL 305 b) AURALL 305M II. III. Equipment a) Volumetric pipettes b) 250 ml Erlenmeyer Flask c) 100 ml Volumetric Flask d) 50 ml Burette Reagents a) Hydrochloric Acid Concentrate, 100 ml/l solution water b) Sodium Bicarbonate c) Iodine, 0.1N IV. Analytical Procedure a) Pipette 1.0 ml of the bath into a 250 ml Erlenmeyer flask b) Add 50 ml D.I. water c) Add approximately 5 ml hydrochloric acid solution d) Carefully add sodium bicarbonate until escaping gas is no longer evident. Add approximately 1 2 grams in excess Page 3 of 5 AURALL 305M Electrolytic Gold / Interconnect Technologies March 2016

4 Determination of (cont d) e) Titrate with 0.1N iodine until a faint yellow endpoint remains at least 30 seconds f) Record milliliters of 0.1N iodine required V. Calculation % Stabilizer in the plating bath = ml x N x 4.70 AURALL 364 Strike AURALL 364 Strike is recommended immediately prior to plating with AURALL 305M Electrolytic Gold to ensure maximum adhesion over nickel and nickel alloys. Refer to Dow data sheets on the AURALL 364 Strike for complete information on its operation. Product Data Associated Products For the specific Product Data values, please refer to the Certificate of Analysis provided with the shipment of the product(s). Before using this product, consult the Material Safety Data Sheet (MSDS)/Safety Data Sheet (SDS) for details on product hazards, recommended handling precautions and product storage. AURALL Make-up Solution AURALL Conductivity Salt AURALL Acid Salt AURALL 305M-1 PGC Replenisher AURALL 305M-1 Additive Equipment Tanks: Polypropylene Anodes: Platinized (titanium, tantalum, or columbium) Heaters: Silica sheathed or PTFE coated immersion Filtration: micron filters with pump capacity for 4 turnovers per hour Agitation: Desirable, solution of mechanical Page 4 of 5 AURALL 305M Electrolytic Gold / Interconnect Technologies March 2016

5 Handling Precautions Storage Disposal Considerations Product Stewardship Customer Notice Before using this product, consult the Material Safety Data Sheet (MSDS)/Safety Data Sheet (SDS) for details on product hazards, recommended handling precautions and product storage. WARNING! DO NOT ACIDIFY this product or working bath containing this product below specified operating ph range, or below ph 7 if no range is specified. Acidification may release highly toxic cyanide gas, which can be fatal if swallowed, inhaled or absorbed through the skin. CAUTION! Keep combustible and/or flammable products and their vapors away from heat, sparks, flames and other sources of ignition including static discharge. Processing or operating at temperatures near or above product flashpoint may pose a fire hazard. Use appropriate grounding and bonding techniques to manage static discharge hazards. CAUTION! Failure to maintain proper volume level when using immersion heaters can expose tank and solution to excessive heat resulting in a possible combustion hazard, particularly when plastic tanks are used. Store products in tightly closed original containers at temperatures recommended on the product label. Dispose in accordance with all local, state (provincial) and federal regulations. Empty containers may contain hazardous residues. This material and its container must be disposed in a safe and legal manner. It is the user's responsibility to verify that treatment and disposal procedures comply with local, state (provincial) and federal regulations. Contact your Dow Electronic Materials Technical Representative for more information. Dow has a fundamental concern for all who make, distribute, and use its products, and for the environment in which we live. This concern is the basis for our product stewardship philosophy by which we assess the safety, health, and environmental information on our products and then take appropriate steps to protect employee and public health and our environment. The success of our product stewardship program rests with each and every individual involved with Dow products - from the initial concept and research, to manufacture, use, sale, disposal, and recycle of each product. Dow strongly encourages its customers to review both their manufacturing processes and their applications of Dow products from the standpoint of human health and environmental quality to ensure that Dow products are not used in ways for which they are not intended or tested. Dow personnel are available to answer your questions and to provide reasonable technical support. Dow product literature, including safety data sheets, should be consulted prior to use of Dow products. Current safety data sheets are available from Dow. For Industrial Use Only. This information is based on our experience and is, to the best of our knowledge, true and accurate. However, since conditions for use and handling of products are beyond our control, we make no guarantee or warranty, expressed or implied, regarding the information, the use, handling, storage or possession of the products, or the applications of any process described herein or the results sought to be obtained. Nothing herein shall be construed as a recommendation to use any product in violation of any patent rights Contact: North America: Taiwan: China: (+86) Hong Kong: (+852) Korea: (+82) Japan: (+81) Europe: (+41)(0) Notice: No freedom from any patent owned by Dow or others is to be inferred. Because use conditions and applicable laws may differ from one location to another and may change with time, Customer is responsible for determining whether products and the information in this document are appropriate for Customer's use and for ensuring that Customer's workplace and disposal practices are in compliance with applicable laws and other government enactments. The product shown in this literature may not be available for sale and/or available in all geographies where Dow is represented. The claims made may not have been approved for use in all countries. Dow assumes no obligation or liability for the information in this document. References to Dow or the Company mean the Dow legal entity selling the products to Customer unless otherwise expressly noted. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED. UNRESTRICTED Page 5 of 5 AURALL 305M Electrolytic Gold / Interconnect Technologies March 2016