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PATENTS GRANTED In the Metal Finishing Field Printed copies of patents are furnished by the Patent and Trademark Office for $3.00 each. Address orders to: Commissioner of Patents and Trademarks, Washington, D.C. 20231. Waste Treatment U.S. Pafenf5,380,441. Jan. fU, 1995 RF: 7Mmfon, assignor to General Electric Co., Schenscfady, N. Y. A method for removing hexavalent chro mium from an electrochemical machining solution, which comprises adding an ex- cess of a stoichiometric amount of metallic iron particles to the electrochemical ma- chining solution to react with the hexava- lent chromium to produce trivalent chro- mium; mechanically agitating the metallic iron particles in the electrochemical ma- chining solution with a sufficient amount of energy to insure that surfaces of the iron particles are free of insoluble precipitates selected from the group consisting essen- tially of iron hydroxide and chromium hy- droxide; main taining pH with an acid be- tween 2 and 7 until the hexavalent chromium is reduced to trivalent chromi- um; and then adjusting the pH with a base to precipitate the trivalent chromium. Etching Process U.S. Pafenf5,380,408. Jan. 10, 1995 R. Svensson, assignor to Sandvik AS, Sandviken, Sweden A method for removing a layer of binder phase formed on the surface of a hard material insert containing hard constituents in a binder phase based on cobalt and/or Three Coating Thickness Measuring Systems For The Price Of One! Li Instantaneously measures your Zn, Cd, Ni, Cr, Cu coatings on almost anybase, including NiKu! Q A variety of new probes will handlepQhsofanyshapeandsize (inside andoutside diameters)! Ci Exclusive mode compare ensures accuracy and con&don. Cl VeecoAJPA offers a complete line of ocketsize, hand held andtabe-top thickness testers. P ,- e UPA Technology We Make The Pro”cee More Productive” Terminal Drive, Plainview,NewYork 11883 For Immediate Information Call 1-808645-7566or 516349_8388 nickel, comprising removing the layer of binder phase formed on the surface by etching electrolytically in a mixture of con- centrated sulfuric acid and concentrated phosphoric acid in a volume ratio of 0.5-2 with a water content of less than 50% at a temperature of 25-6OC. Electrocoating Process U.S. Pafenf5,380,412. Jan. 10, 1995 G. Ott et al., assignors to BASF La&etFatben AG, Mgnsfer, Germany A process for coating electrically con ducting substrates, comprising immersing in an aqueous electocoating bath, which contains a cationic amine-modified epoxy for ELECTROLESS PLATING WASTE TREATMENT SECONDARY CONTAINMENT ??No need for expensive tank passivation ??Flexible PVC or polyurethane construction ??Electronically lap-welded seams for superior strength ??Custom made to your exact dimensions ??Easy inexpensive drop-in installation ??High resistance to plating solutions ??Good heat transfer Excellent for Electroless Nickel Plating Fast, Reliable, Friendly Service Stringent Quality Control Supplying Silicon Valley for Years CALL 800-423-2380 Circle 068 on reader informatIon card Circle 014 on reader information card 98 METAL FINISHING . SEPTEMBER 1995

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Page 1: Etching process

PATENTS GRANTED In the Metal Finishing Field Printed copies of patents are furnished by the Patent and Trademark Office for $3.00 each. Address orders to: Commissioner of Patents and Trademarks, Washington, D.C. 20231.

Waste Treatment U.S. Pafenf5,380,441. Jan. fU, 1995 RF: 7Mmfon, assignor to General Electric Co., Schenscfady, N. Y.

A method for removing hexavalent chro mium from an electrochemical machining solution, which comprises adding an ex- cess of a stoichiometric amount of metallic iron particles to the electrochemical ma- chining solution to react with the hexava- lent chromium to produce trivalent chro- mium; mechanically agitating the metallic iron particles in the electrochemical ma- chining solution with a sufficient amount of energy to insure that surfaces of the iron particles are free of insoluble precipitates

selected from the group consisting essen- tially of iron hydroxide and chromium hy- droxide; main taining pH with an acid be- tween 2 and 7 until the hexavalent chromium is reduced to trivalent chromi- um; and then adjusting the pH with a base to precipitate the trivalent chromium.

Etching Process U.S. Pafenf5,380,408. Jan. 10, 1995 R. Svensson, assignor to Sandvik AS, Sandviken, Sweden

A method for removing a layer of binder phase formed on the surface of a hard material insert containing hard constituents in a binder phase based on cobalt and/or

Three Coating Thickness Measuring

Systems For The Price Of One!

Li Instantaneously measures your Zn, Cd, Ni, Cr, Cu coatings on almost any base, including NiKu!

Q A variety of new probes will handlepQhsofanyshapeandsize (inside and outside diameters)!

Ci Exclusive mode compare ensures accuracy and con&don.

Cl VeecoAJPA offers a complete line of ocket size, hand held and tab e-top thickness testers. P

,-

e UPA Technology We Make The Pro”cee More Productive”

Terminal Drive, Plainview, New York 11883 For Immediate Information Call 1-808645-7566 or 516349_8388

nickel, comprising removing the layer of binder phase formed on the surface by etching electrolytically in a mixture of con- centrated sulfuric acid and concentrated phosphoric acid in a volume ratio of 0.5-2 with a water content of less than 50% at a temperature of 25-6OC.

Electrocoating Process U.S. Pafenf5,380,412. Jan. 10, 1995 G. Ott et al., assignors to BASF La&etFatben AG, Mgnsfer, Germany

A process for coating electrically con ducting substrates, comprising immersing in an aqueous electocoating bath, which contains a cationic amine-modified epoxy

for ELECTROLESS PLATING

WASTE TREATMENT SECONDARY CONTAINMENT

??No need for expensive tank passivation

??Flexible PVC or polyurethane construction

??Electronically lap-welded seams for superior strength

??Custom made to your exact dimensions

??Easy inexpensive drop-in installation

??High resistance to plating solutions

??Good heat transfer

Excellent for Electroless Nickel Plating Fast, Reliable, Friendly Service

Stringent Quality Control Supplying Silicon Valley for Years

CALL 800-423-2380

Circle 068 on reader informatIon card Circle 014 on reader information card

98 METAL FINISHING . SEPTEMBER 1995

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