Patents Assigned to R. O. Hull & Company, Inc.
  • Patent number: 4171231
    Abstract: Aqueous acidic coating solutions are described for treating zinc or zinc alloy surfaces comprising trivalent chromium as substantially the only chromium ion present, fluoride ion, an acid other than nitric acid, and an oxidizing agent. The coating solutions containing trivalent chromium as substantially the only chromium ion present preferably are prepared by reducing an aqueous solution of hexavalent chromium with sufficient reducing agent to reduce all of the hexavalent chromium to trivalent chromium. Chromate coatings on zinc and zinc alloy surfaces are produced by contacting said surfaces with an aqueous acidic solution of the invention.
    Type: Grant
    Filed: April 27, 1978
    Date of Patent: October 16, 1979
    Assignee: R. O. Hull & Company, Inc.
    Inventors: Craig V. Bishop, Thomas J. Foley, James M. Frank
  • Patent number: 4169772
    Abstract: An aqueous acidic plating bath for the electrodeposition of a bright zinc deposit on a substrate is disclosed and comprises zinc ions and an amount, sufficient to provide a level and bright deposit, of at least one bath-soluble composition obtained by the reaction of a nitrogen-containing heterocyclic compound with formaldehyde, an epihalohydrin or glycerol halohydrin and at least one amino compound selected from the group consisting of (i) ammonia, (ii) an aliphatic amine, or (iii) an amidine. Additionally, the plating baths of the invention may contain a nitrogen-containing compound obtained by the reaction of ammonia, an aliphatic amine containing at least one primary amine group, or mixtures thereof with one or more epihalohydrins, glycerol halohydrins or mixtures thereof. Thioureas and anionic aromatic sulfonic acids or salts thereof also are contemplated as being useful in the plating baths of the invention.
    Type: Grant
    Filed: November 6, 1978
    Date of Patent: October 2, 1979
    Assignee: R. O. Hull & Company, Inc.
    Inventors: Richard K. Lowery, William J. Willis
  • Patent number: 4165242
    Abstract: A method of treating metal parts to provide durable and rust-inhibiting coatings is described. The application method can be used to treat single parts or bulk barrel processing of parts. The method comprises the steps of(a) phosphating the metal parts with an aqueous metal phosphating solution,(b) electrophoretically depositing a siccative organic coating on the phosphated metal parts, and(c) applying a corrosion inhibiting film of oil as a seal coat.
    Type: Grant
    Filed: November 21, 1977
    Date of Patent: August 21, 1979
    Assignee: R. O. Hull & Company, Inc.
    Inventors: Roger A. Kelly, Howard G. Pekar
  • Patent number: 4162947
    Abstract: An aqueous acidic plating bath for the electrodeposition of a bright zinc deposit on a substrate is disclosed and comprises zinc ions, ammonium ions and at least one aromatic sulfonic acid or salt having the general formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are each independently hydrogen or lower alkyl groups,X is hydrogen, ammonia or any metal with the proviso that the metal sulfonate is soluble in the bath, andA is a saturated, unsaturated or aromatic ring.Additionally, the plating baths of the invention may contain aromatic carbonyl-containing compounds and particularly aromatic aldehydes containing at least one halogen substituent. Polyoxyalkylated naphthols and polyalkylene glycol ethers as well as poly(alkyleneimines) also are contemplated as being useful in the plating baths of the invention. Methods for depositing a bright zinc coating over a wide range of current densities, and additive compositions for preparing plating baths useful in these methods also are described.
    Type: Grant
    Filed: May 22, 1978
    Date of Patent: July 31, 1979
    Assignee: R. O. Hull & Company, Inc.
    Inventor: Valerie M. Canaris
  • Patent number: 4152176
    Abstract: The present invention relates to an improved method of preparing titanium-containing phosphate conditioners useful in cleaning and activating the surface of ferrous, zinc or aluminum metal and alloys thereof for subsequent reaction with phosphate coating solutions. The method comprises the steps of(a) preparing a mixture consisting essentially of water, sodium tripolyphosphate, disodium phosphate and a titanium-containing compound and(b) adding said mixture to solid disodium phosphate with mixing whereby a solid titanium phosphate composition is obtained.The invention provides a method for forming a dry activating composition which does not require the application of any energy such as heat to the material. When the solid titanium phosphate compound is dissolved in water to form pretreatment solutions it can be employed successfully for activating metal surfaces in preparation for reaction with phosphate coating solutions.
    Type: Grant
    Filed: August 7, 1978
    Date of Patent: May 1, 1979
    Assignee: R. O. Hull & Company, Inc.
    Inventor: Donald J. Guhde
  • Patent number: 4146442
    Abstract: Aqueous plating baths for the electrodeposition of a zinc coating on a substrate are disclosed and comprise zinc ions to which has been added an amount, effective to provide a level and bright zinc electrodeposit, of a polymeric nitrogen-containing compound prepared by reacting a poly(alkyleneimine) with a cyclic carbonate consisting of carbon, hydrogen and oxygen atoms. More particularly, the poly(alkyleneimine) has a molecular weight within the range of from about 200 to about 100,000, and the cyclic carbonate is one wherein the ring oxygen atoms adjacent to the carbonyl grouping are each bonded to a ring carbon atom, and the ring containing the oxygen and carbon atoms has only three carbon atoms and no carbon-to-carbon unsaturation.The aqueous plating baths of the invention may be acid zinc plating baths or alkaline cyanide or non-cyanide containing plating baths.
    Type: Grant
    Filed: May 12, 1978
    Date of Patent: March 27, 1979
    Assignee: R. O. Hull & Company, Inc.
    Inventor: Charles W. McFarland
  • Patent number: 4146441
    Abstract: A composition as described which is useful particularly in improving the electrodeposition of bright zinc from aqueous acidic plating baths. The new composition comprises a reaction product obtained by the process of preparing an intermediate composition by reacting formaldehyde in water with sulfamic acid and at least one aliphatic acyclic amine containing at least one primary amine group, and thereafter reacting said intermediate compound with at least one epihalohydrin or glycerol halohydrin or mixtures thereof. Aqueous acidic zinc plating baths containing the additive compositions of the invention and methods for depositing a bright zinc coating over a wide range of current densities also are described.
    Type: Grant
    Filed: April 10, 1978
    Date of Patent: March 27, 1979
    Assignee: R. O. Hull & Company, Inc.
    Inventor: William J. Willis
  • Patent number: 4139425
    Abstract: A composition is described which is useful particularly in improving the electrodeposition of tin, lead or tin-lead from an aqueous acidic plating bath. The new composition comprises a reaction product of an unsaturated nitrogen-containing heterocyclic compound with a mixture comprising formaldehyde and an unsaturated aliphatic aldehyde containing up to about six carbon atoms. Aqueous acidic plating baths containing the additive compositions of the invention, and methods for depositing tin, lead or tin-lead alloys from such baths as well as additive compositions for forming the baths also are described.
    Type: Grant
    Filed: April 5, 1978
    Date of Patent: February 13, 1979
    Assignee: R. O. Hull & Company, Inc.
    Inventors: William E. Eckles, William J. Willis
  • Patent number: 4135991
    Abstract: An aqueous acid plating bath for electrodeposition of tin, lead or tin-lead alloys on a substrate is described and comprises at least one metal salt selected from the group consisting of a stannous salt, a lead salt or a mixture of stannous and lead salts, and as a brightener agent, an effective amount of at least one alkoxylated amine of the formula ##STR1## wherein R is a fatty acid alkyl group containing from about 8 to about 22 carbon atoms,R.sup.1 is an alkylene radical containing up to about 5 carbon atoms,R.sup.2 and R.sup.3 are each independently an ethylene or propylene group,A is 0 or 1, andX, y and z are each independently integers from 1 to about 30, and the sum of x, y, and z is an integer of from about 2 to about 50.Methods for the electrodeposition of tin, lead, or tin-lead alloys from such baths as well as additive compositions for forming the baths also are described.
    Type: Grant
    Filed: August 12, 1977
    Date of Patent: January 23, 1979
    Assignee: R. O. Hull & Company, Inc.
    Inventors: Valerie M. Canaris, William J. Willis
  • Patent number: 4134803
    Abstract: Nitrogen and sulfur compositions are described which are useful in aqueous acidic plating baths and processes for electrodepositing bright and level copper coatings. The compositions are prepared by reacting a mixture of(a) a disulfide having the formula[RR'NCS.sub.2 ].sub.2 (Formula I)wherein R and R' are each independently hydrogen, alkyl or aryl groups, and(b) a halo hydroxy sulfonic acid having the formulaX(CH.sub.2).sub.n CHOH--CH.sub.2 SO.sub.3 M (Formula II)wherein X is a halogen, n is one or two and M is hydrogen or an alkali metal, in(c) an aqueous alkaline medium.Particularly bright and level deposits are obtained when the reaction mixture used to form the composition also contains an aliphatic aldehyde containing up to three carbon atoms. The presence of the above-described brightening and leveling agents in acid copper plating baths produces a lustrous, smooth and level deposit of copper over a wide range of current densities, particularly when wetting agents are included in the plating baths.
    Type: Grant
    Filed: December 21, 1977
    Date of Patent: January 16, 1979
    Assignee: R. O. Hull & Company, Inc.
    Inventors: William E. Eckles, Thomas W. Starinshak
  • Patent number: 4076600
    Abstract: An aqueous plating bath for the electrodeposition of a zinc coating on a substrate is disclosed and comprises zinc ions, and an amount, sufficient to provide a level zinc electrodeposit, of one or more bath-soluble leveling phosphorus cations having the formula:R.sub.4 P .sym.wherein each R is independently a hydroxy alkyl group. Baths are also described which contain, in addition to the phosphorus cations identified above, at least one nitrogen-containing compound obtained by reacting (a) ammonia, an aliphatic amine containing at least one primary amine group, or mixtures of two or more of any of these with (b) one or more epihalohydrins, glycerol halohydrins, or mixtures thereof, and at least one thiourea having the general formula:[R'.sub.2 N].sub.2 CSwherein each R' is independently hydrogen or an alkyl or alkenyl group. Methods for electrodeposition of level zinc deposits from such baths and additive compositions for preparing and maintaining the baths are disclosed.
    Type: Grant
    Filed: December 20, 1976
    Date of Patent: February 28, 1978
    Assignee: R. O. Hull & Company, Inc.
    Inventor: Karen Huebner
  • Patent number: 4075066
    Abstract: The present invention provides an ammonia-free acid zinc plating bath for electrodepositing bright zinc on a substrate in which the zinc deposit produced thereby is ductile and presents a glossy to bright coating on the substrate over a wide cathodic current density range. The ammonia-free acid zinc plating baths of the invention comprise zinc ions, chloride ions, at least one polyoxyalkylated naphthol, at least one aromatic carboxylic acid or bath-soluble salt thereof, and at least one anionic aromatic sulfonic acid or bath-soluble salt thereof. In addition to the above components, the ammonia-free acid zinc plating baths of the invention may contain at least one nonionic polyoxyethylene compound and at least one aromatic aldehyde, ketone, or mixtures thereof. The ammonia-free acid zinc plating baths of the invention are free from significant amounts of complexing agents that would impede the removal of zinc ions from the baths prior to disposal.
    Type: Grant
    Filed: January 27, 1977
    Date of Patent: February 21, 1978
    Assignee: R. O. Hull & Company, Inc.
    Inventors: William Edward Eckles, Valerie Canaris
  • Patent number: 4038161
    Abstract: An acid plating bath and an improved process for electrodepositing level copper coatings are described. The improved copper plating baths and method include a bath soluble organic leveling compound which is obtained by reacting one or more epihalohydrins with one or more nitrogen-containing compounds which may be substituted pyridines, quinolines, isoquinoline or benzimidazole. Particularly improved results are obtained if the acid copper bath also contains, in addition to the leveling agent, a bath-soluble brightening agent and a wetting agent. The presence of the above-described leveling agent in acid copper plating baths produces a lustrous, smooth and level deposit of copper over a wide range of current densities.
    Type: Grant
    Filed: March 5, 1976
    Date of Patent: July 26, 1977
    Assignee: R. O. Hull & Company, Inc.
    Inventors: William Edward Eckles, Thomas Walter Starinshak
  • Patent number: 3956123
    Abstract: The invention disclosed herein relates to the electrolytic deposition of bright tin and tin-lead alloy. This invention is embodied in a new plating bath and a plating bath additive. The new plating bath includes tin or tin and lead ions, sulfuric acid or fluoboric acid, and the new additive. The new additive includes an emulsified naphthalene monocarboxaldehyde with or without a substituted olefin, having the general formula: ##EQU1## in which R.sub.1 is carboxy, carboxamido, alkali carboxylate, ammonium carboxylate, amine carboxylate, or alkyl carboxylate, and R.sub.2, R.sub.3, and R.sub.4 are hydrogen, methyl, or lower alkyl.
    Type: Grant
    Filed: March 12, 1975
    Date of Patent: May 11, 1976
    Assignee: R. O. Hull & Company, Inc.
    Inventors: William E. Rosenberg, William E. Eckles