treatment unit; introducing a neutralizing agent to raise the pH of the water into the treatment unit; introducing oxidant selected from air and gaseous oxygen at the same point at which neutralizing agent is intro- duced into the water to be treated; agitating the water, oxidant, and neutralizing agent; providing a means for receiving precipi- tates from the mixture; and discharging treated water from the unit.

Cold Cleaning Solvent U.S. Patent 5552,090. Sept. 3, 1996 M.S. Wrier, assignor to E/f A&hem North America Inc., Philadelphia

A nonazeotropic solvent blend useful for cold cleaning applications in an open envi- ronment consisting essentially of 1060% of a halocarbon component selected from l,l-dichloro-1-fluoroethane and 1,1,2,3,3- pentafluoropropane;, l-30% of a nonflam- mable chlorinated solvent component with a boiling point of 80-130°C selected from the group consisting of perchloroethylene, trichloroethylene, and mixtures thereof; and lWO% of an oxygenated organic sol- vent component having at least 3 carbons, a flash point over 0°C and a boiling point

intermediate that of the other two compo- nents, said components and their propor- tions being chosen such that the blend has an average vapor pressure of 2-7.6 psia and a substantially lower ozone depletion po- tential than 1,1,2-trichloro- 1,2,2-trifluoro- ethane or l,l,l-trichloroethane, and when the blend is allowed to evaporate the result- ant vapor fractions and liquid fractions each have no flash point.

Triboelectric Powder Coating U.S. Patent 5,552,191. Sept 3, 1996 RR. Horinka and M.J. KorecQ, assignors to Morton lnfemational Inc., Chicago

A coating process wherein plastic pow- der is fed to a triboelectric spray gun and in which the powder is then spray deposited onto a substrate, said powder having an average particle size between ‘35 and 36 microns, the improvement wherein the powder has particle size distribution com- prising, all in percents by weight 100% smaller than 88 microns; 10-E% smaller than 15.56 microns. and 4-6% smaller than 11 microns.

Multilayer Coating Simulating Brass U.S. Patent 5552,233. Sept. 3, 1996 S.R. Moysan and R. W. Sugg, assignors to Baldwin Hardware Corp., Reading, Pa.

An article comprising a metallic sub- strate having disposed on at least a portion of its surface a multilayer coating simulat- ing brass comprising a layer of semibright nickel; a layer of bright nickel; a layer of tin-nickel alloy; a layer comprised of zir- conium or titanium; and a top layer com- prised of zirconium or titanium compound.

Method for Powder Coating U.S. Patent 5,552,487. Sept. 3, 7996 RI Clark et al, assignors to BASF Corp., Southfield, Mich.

A method of coating a substrate with a thermoset powder coating composition comprising electrodepositing a primer layer on the surface of a metal substrate; and applying a layer of thermosetting pow- der coating composition including a film- forming resinous binder including a copol- ymer selected from the group consisting of epoxy, polyester, and acrylic copolymers,

TENSIOMETER THE SIMPLEST WAY TO COMPLY WITH THE NEW

CHROMIUM EMISSIONS REGULATIONS

0 Accurate way to measure Surface Tension

??DiiNouy ring and Wilhelmy plate methods,

0 Measurements: 0 - 200 dynes

??Resolution: 0.1 mN/m

0 Digital readout 0 Electronic offset

for corrected readings

INSTRUMENTS .# l-800-280-621 (

ROBOX 192 MONROE, CT 06468 fax 203-459-0431

Circle 079 on reader information card Circle 077 on reader information card

90 METAL FINISHING . MAY 1997