摘要:
A copper installation pipe having a tin coating that is applied with temperature control so as to be adherent over the entire inner surface. The thickness of the intermetallic phase formed at the transition from the copper pipe to the tin coating is less than 20%, preferably less than 5% of the overall coating thickness. In addition, a method for coating an installation pipe using chemical treatment, where the temperature of the tinning solution is selectively varied. To ensure the smallest possible intermetallic phase at the copper surface, one begins the tinning process at a low temperature. This promotes the formation of a large number of uniformly distributed nuclei of crystallization having the same orientation. The temperature is then selectively adjusted to promote crystal growth, the result being that the crystals grow rapidly with the orientation remaining constant. One then achieves a dense tin coating having a minimal exposed surface area.
摘要:
A process for depositing metals onto electrically conductive, polymeric carriers, wherein a finely divided metal M having a standard potential E.sub.o of >-2 V is deposited, from a solution of a metal cation compound of the formula (I) ##EQU1## where M', L.sup.1, L.sup.2, L.sup.3, L.sup.4, l, m, n, o, and p are as defined in the claims, in an aprotic polar or non-polar solvent, onto a polymeric, electrically conductive carrier of the formula (II) ##EQU2## where M" is Li, Na, K, Rb or Cs,P is P=--CH--, --C.sub.6 H.sub.4 --, --C.sub.4 H.sub.2 S--, --C.sub.6 H.sub.4 S--, --C.sub.4 H.sub.2 O--, --C.sub.4 H.sub.2 NH-- --C.sub.6 H.sub.4 O-- or --C.sub.5 H.sub.3 N--y is from 0.001 to 0.6 andx is from 5 to 1,000, or onto a polymeric, electrically conductive carrier of the formula (III)[(P)(X).sub.y ].sub.x (III)whereP is one of the groups listed for formula (II), X is ClO.sub.4.sup..crclbar., AsF.sub.6.sup..crclbar., PF.sub.6.sup..crclbar., SbF.sub.6.sup..crclbar., BF.sub.4.sup..crclbar., HSO.sub.4.sup..crclbar., CF.sub.3 SO.sub.3.sup..crclbar. or Br.sup..crclbar.,y is from 0.001 to 0.6 andx is from 5 to 1,000, by reduction, preferably at from -100.degree. to +100.degree. C. The electrically conductive, polymeric systems can be employed in the electrical industry for the production of solar cells, for converting and fixing radiation, and for the production of electric and magnetic switches and electrical storage devices, and can also be used as heterogeneous catalysts and to provide an antistatic finish on plastics.
摘要:
An electroless copper plating bath which is in the take mode is provided by determining the amount in the bath of at least four of the components selected from the group of oxygen, reducing agent, cyanide salt, cupric salt, and complexing agent; solving the equation:R=(CABD)/Ewherin C is the concentration of cupric salt, A is the concentration of reducing agent, B is the concentration of oxygen, D is the concentration of cyanide salt, E is the concentration of complexing agent, and R is a unitless number.The bath is provided with quantities of the above ingredients so that R in the equation is between about 5 and about 15.
摘要:
Copper is deposited onto a substrate by plating a first layer of copper onto the substrate from an electroless plating bath and plating a second layer of copper onto the first layer of copper from a second and different electroless plating bath. The first and second plating baths differ from each other in at least the cyanide content and oxygen content. The process reduces plating void defects and reduces nodule formation.
摘要:
A simple and highly effective process for preparing the surface and plating a plastic or elastomer material is disclosed by the present invention.A uniform, highly adherent metal layer is deposited by the claimed process. The surface of the materials to be plated is prepared by exposure to a gas etch atmosphere and activation of the etched surface by providing a metal colloid thereon. Another aspect relates to the use of a one-step or two-step conditioner treatment in the process for improved results.After the surface preparation and activation, a desired metal coating can be electroless metal plated in a conventional manner.
摘要:
Electrical contact materials are provided which belong to the general category of copper that is overplated with a noble metal, usually gold. The improvement resides in the provision of an electroless nickel deposit laid down over the copper layer and under the gold layer, which electroless nickel deposit is laid down from a particular class of nickel-boron or nickel-phosphorus baths.
摘要:
A powdered composition for use in dry sensitization for electroless metal deposition. The composition contains a hydrophobic thermoplastic material having deposited on its surface a surfactant and a sensitizing tin compound.
摘要:
A nickel and/or cobalt chemical plating bath comprises: a salt of the metal(s) to be deposited; one or more complexing agents of said metal(s), a reducing agent based on boron or phosphorous; and a stabilizing agent. To avoid including sources of corrosion and/or toxic substances in the plating, the stabilizing agent comprises a water soluble organic compound which possesses a readily accessible electron pair, and which does not include any metal or metalloid from group IIIa (other than boron or aluminum), IVa (other than carbon), Va (other than nitrogen or phosphorous), VIa (other than oxygen), or VIIa (other than fluorine or chlorine).
摘要:
A process and composition for use in electroless copper plating where the process includes contacting a substrate with a solution comprising copper, a complexing agent, a reducing agent, and a pH adjuster. A stabilizer may also be used. The improvement of the present invention includes contacting the substrate with a solution further comprising ammonium ions present in an amount effective to function as a plating rate controller. The improved solution is relatively stable, easy to control, and is of versatile use.
摘要:
A process for treating a polymeric plastic substrate to render it receptive to electroless plating in a process of the type including the steps of etching the substrate and activating the etched substrate. The present improvement includes the step of accelerating the activated substrate with an improved aqueous accelerating solution containing an aqueous soluble compatible oxidizing agent present in an amount effective to increase the activity of the accelerating solution. The improved accelerating solution inhibits the plating of stop-off coatings and plating racks and is of versatile use.