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Bacteriological Recovery of Selenium
Bacteriological treatment of aqueous solutions for metal removal
Conc. of water soluble metal ions in aq. soln is reduced by continuously passing it through porous matrix containing cultured populations of aerobic metal oxidising bacteria from genus Metallogenium capable of metabolising metal ions into insoluble metal oxides, which are retained on porous matrix.
Bad classification of electroplating additive agents and bad consequences.
Bad classification of electroplating additive agents and bad consequences were discussed. Brighteners for bright nickel plating were sometimes classified as brightener and flexibility agent that may not only confuse the action of primary brightener with that of the secondary brightener, but also result in misleading the user in adding reagent just based on brightener's name. Bad classification of brighteners for bright copper plating may result in bad effect and disproportion in use of brightener, because the synergetic effect between various components of brightener and Col*- often plays an important role and their functions are not easily identified. Some assistants such as brighteners. for acidic bright tin plating and non-cyanide alkaline copper plating concentrate must be classified detailedly so as to facilitate maintenance, control and reducing cost in large scale production as well as promotion and application of new technology.
Bake hardenable steel coated with water-based chromium bearing organic resin
Bake hardenable steel for deep drawing is coated on 1 or more sides with continuous chromium bearing epoxy coating. Sheet is roll coated with continuous liquid film containing >2 wt% water dispersible or emulsifiable epoxy resin, >0.5 wt% Cr compound and 25-97wt% water, induction heated at >149›C to form coating resistant to dissolution of Cr and steelbase metal having yield pt. elongation ½0.3%. Deep drawn article formed on sheet has improved painting properties.
Bakeout Effects & Characteristics of Multilayer Printed Circuit Boards
Effect of mild, as opposed to fierce, bake-outs of p.c.b's based on epoxy resin in terms of the structure of the plated through hole (PTH) are studied. Thermomechanical analysis and similar methods, and the derivation of the coeff't of thermal expansion, are not very sensitive indices of what is happening.
Baking & Curing Oven Showcase
Photos & notes on commercial ovens, infra-red curing, gas ovens, tunnel ovens, oven equipment.
Baking of Hard Chromium
Chat about heat treatment of Cr plated work to remove H embrittlement.
Baking oven vitreous enamelling
Five coating options are listed incl. easy-clean, pyrolytic & catalytic. Tables list their various properties and application areas (kitchen ovens, baking accessories). Typical surface roughness profiles are shown. Cleanability (ease of cleaning) test is detailed. The relationship between wetting contact angle and cleanability is noted, the greater the wetting angle, theless foodstuff adheres. Test routines using actual foodstuffs and test temperatures are discussed. photos show outcomes of such tests. Discussion of pyrolytic enamels and their properties & testing, such as cleanliness after the high temperature excursion. French AFNOR standards are quoted, test equipment is shown. similar comments on catalytic enamels, citing ISO 8291. The 5 coating types are shown as a price-performance graph, the lower categories now only used for budget priced products. 1 ref
A review of the uses of baking phenolics, their benefits and limitations, chemical composition,curing mechanisms, VOC, physical properties, surface preparation, application and curing and safety aspects.
Baking Requirements for CRES & Non-Ferrous Alloys
Covers test procedures, hydrogen content in metal. Graph shows H sensitivity of various engineering metals. Paper is summary of practice at Boeing.
Baking Requirements for Gas Turbine Engine Plating Applications
Deals with pre- and post-plate baking. Lists a number of alloy types, US standards relevant and questions of fatigue & hydrogen embrittlement. 60 refs
Uses thermoplastic polyamide with added cross-linking agent which is heat activated, incl. polyvalent alcohol, polyol & polyisocyanate. A thus coated wire is also claimed.
Baking Times for Electroplated Steel
Disc'n of heat treatment of plated steel (mainly Cd).
Balanced electromagnetic peenings
Electromagnetic peening apparatus incl. 2nd electromagnetic coils in contact with workpiece. Electromagnetic force plastically deforms workpiece at surfaces to effect compressive layer.
Balanced high-volume, low pressure paint spray gun
Balanced HVLP paint spray gun with paint atomizing chamber, atomizing and shaping air passages. Paint spray patterns shaping zone communicates with paint passage and atomizing air passage for shaping spray patterns of atomized paint. Air pressure zone communicates with balancing air passage for regulating air pressure between atomizing and shaping air chambers.