JPS5834170A - Concentrated copper solution for electroless copper plating solution vat - Google Patents

Abstract

PURPOSE:To provide a concd. copper soln. for electroless copper plating soln. vats which prevents freezing and crystallization of cupric salt by adding chlorine ion and bromine ion supplying sources to the concd. copper soln. consisting essentially of cupric salt. CONSTITUTION:A concd. copper soln. for electroless copper plating soln. vats preped. by adding about 2-70g/l supplying sources for chlorine ions and bromine ions such as hydrochloric acid, sodium chloride, copper chloride (II), hydrogen bromide, sodium bromide, or the like to a concd. copper soln. consisting essentially of cupric salt such as copper sulfate. Crystal deposition and freezing of copper sulfate, etc. can be suppressed by the compsn. of such concd. copper soln. The properties as an electroless copper plating soln. such as the rate of deposition, stability, adhesive power or the like are equal to or better than those of solns. without added with any halogen ions.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concentrated solution used when preparing a 1 cm electroless copper plating solution.

The main components of electroless steel plating solution are cupric salts such as copper sulfate, complexing agents such as EDTA (ethylene diamine tetraacetate), reducing agents such as formalin, and alkali hydroxide. Does it consist of υPH adjuster, etc.?

In general, when preparing a bath #:t#! Concentrated liquid mainly composed of dicopper salts and formalin, and 7 tons mainly composed of alkali hydroxide 9
#Ik Condensation: Mix both and dilute 5 to 20 times with pure water. When formalin and alkali hydroxide are combined, the formalin gradually decomposes. Further, when a cupric salt and an alkali hydroxide are combined, precipitation of hydroxide steel occurs.

The t-copper concentrate, which is mainly made of cupric salts such as cfJcoa acid ferric steel, has a high copper concentration, so it can be used at low tptL (-10℃) such as in winter.
(below) when storing in O, freeze W1 sulfur 11I! The problem is that crystals of cupric salts such as second steel tend to precipitate.Ion supply source 1-Ion is added to prevent freezing and crystallization of cupric salts.

That is, the present invention produces a copper concentrate for use in an electroless steel plating liquid bath by adding a chlorine and bromine ion source to a copper concentrate containing 1s 2 steel salt as a living body. For example, sulfuric acid steel 50 to 200 g/4 is used as a copper concentrate.
Formalin (37%) A solution of 50 to S 00 mj/j is used.

In this case, it is not necessary to add formalin.The sources of chlorine and bromide ions used in this process are:
Preferably chlorine, bromine, sodium, potassium, cupric salt, or hydrogen chloride or hydrogen bromide, 2g per water at room temperature
Those having a solubility t of 71 or more are used. Examples include hydrochloric acid, sodium chloride, potassium chloride, steel chloride (II
) hydrogen bromide, sodium bromide and bromide steel shell n.

・Salt odor type ion supply m source V saturated violet is 2 to 70 g/j
Or preferable.

112 sulfur tanks 50-200 g/I and formalin 50-300 mJ/j 2-70 rjl supplying halogen ions such as sodium chloride to tlJ solution
By adding g/J, the crystal precipitation and freezing of Yang Tseng and Chuan copper can be significantly suppressed.The characteristics of svLm copper plating solution (precipitation speed *s stability, compact layer strength) are based on halogen ion sources such as sodium chloride. 7t
.

Central 71? I sulfuric acid steel 150 g/j s and formalin (57
%) 200 mA/j 1/Jlla 20 g/4 of sodium chloride was added to the solution, crystallization occurred, and the frozen state was changed to 11 Jt' for observation.

Table 1 Storage stability of a concentrated solution consisting of sulfuric acid steel and formalin. Freezing did not occur.

Claims (1)

[Claims] 1. Add chlorine ion and bromine ion sources to a copper concentrate containing cupric salt as the main ingredient, and make 7 an electroless steel plating solution V for pleasure bathing.
Copper S condensate.