JPS609592B2 - Surface treatment agent for copper and copper alloy parts - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a surface treatment agent that is applied prior to phosphor annealing treatment of pipes and materials made of copper and copper alloys, and in particular degreases and cleans the surface of the member. During sintering, it prevents parts from adhering to each other, loss of slipperiness, and surface discoloration.
Furthermore, the present invention relates to a surface treatment agent that has properties such as protecting the surface of a component after it has been dulled.

In general, when parts such as pipes and strips made of copper and steel alloys are subjected to moth dulling treatment, these parts are usually bundled together, so if sintered anchorage is performed without any surface treatment,
There may be problems such as tight bonding between members, and in the case of reduced dawn anchors, the surfaces of the members may be activated, resulting in a loss of slipperiness between the members and an increase in frictional resistance. Discoloration occurred.

Therefore, in order to solve these problems such as tight bonding, loss of slipperiness, and surface discoloration (hereinafter, these problems are collectively referred to as "adhesive discoloration"), various adhesive discoloration prevention methods have been developed. agent is being applied.

However, when applying a conventional adhesive discoloration prevention agent to the surface of a member, a degreasing and cleaning step is essential prior to this, and as a result, two steps are inevitably required.

From the above-mentioned viewpoint, the present inventors conducted research to obtain a surface treatment agent that can simultaneously perform degreasing and prevention of adhesion and discoloration during moth dulling treatment of copper and steel alloy members. ) petroleum-based solvents or chlorinated hydrocarbon-based solvents,
A silicate ester having the general formula: (in the above formula, R represents an alkyl group or aryl group having 1 to 8 carbon atoms, and n represents an integer of 1 to 100) (usually n is 100
mixture of polymers with various values below) from 0.05 to
When copper and copper alloy members are soaked in a surface treatment agent containing 1.0% by weight, the oil film adhering to the surface of the part is removed by the solvent, and at the same time the oil film is removed. The organic silicate compound adheres to the surface of the component, and when the component is taken out into the atmosphere in this state, the organic silicate compound is hydrolyzed by the moisture present in the atmosphere and becomes a highly condensed silicate ester. Alternatively, an extremely thin coating made of poppy dioxide, a base (Si02), which is difficult to discern with the naked eye, is formed on the surface of the member.

In this case, if a chlorinated hydrocarbon solvent such as trichloroethylene is used, HCI, a decomposition product of the chlorinated solvent, will be present in large quantities, and this HCI will act as a catalyst to carry out the above-mentioned condensation "decomposition reaction". {b- The film formed on the surface of the above member is
In the next Kenanori process (Akatsuki temperature: 400 to 650oC), condensation and decomposition proceed further, and the products of condensation and decomposition, such as alcohol, are easily gasified and removed. An extremely thin and uniform film of Si02 is formed.'c-The resulting Si02 film prevents density discoloration of the material, protects the surface of the material after dawning, and further When brazing and bonding parts, it should very easily separate and float from the brazing flux without impairing the action of the flux.

'd) Furthermore, the surface treatment agent mentioned in the above item {a) "i.e., a surface treatment consisting of a surface treatment agent consisting of the above-mentioned solvent and silicate ester mixed and dissolved with 0.01 to 0.2% by weight of a triazole compound. When copper and copper alloy members are immersed in the solvent, the triazole compound preferentially adheres to the surface of the member from which the oil film has been removed by the solvent, and the silicate ester adheres thereon. When the triazole compound is acidic and has H+ ions, the decomposition of the silicate ester is promoted, and as a result, the adhesion discoloration prevention effect appears additively.

The findings shown in 'a} to [d} have been obtained above. This invention was made based on the above knowledge, and examples of the silicic acid ester include tetramethoxysilane, tetraethoxysilane, and tetran-ph. Ropoxysilane, tetra-n-phthoxysilane, tetra-n-pentoxysilane "7tra-n-hexoxysilane, tetra-n
-heptoxysilane, tetra-n-octoxysilane, tetraphenoxysilane, tetrabenzoxysilane, natraphenetoxysilane, polymers thereof (where n is 100 or less), and mixtures thereof. However, from the viewpoint of handling and price, a mixture of tetraethoxysilane polymers with various values of n of 100 or less is acceptable. The reason why the content of the organic silicate compound is set at 0.05 to 1% by weight is that if the content is less than 0.05% by weight, the desired effect will not be achieved. On the other hand, if the content exceeds 1.0% by weight, not only will the degreasing ability of the solvent decrease, but it will also be uneconomical. Specific examples of the triazole compound include penzotriazole, tolyltriazole, diphenyltriazole, and diheptyltriazole, but it is particularly desirable to use diphenyltriazole and diheptyltriazole.

Further, the content of the triazole compound is 0.01 to 0. The reason why the content is less than 0.01% by weight is that the desired effect in promoting the decomposition of silicate esters cannot be obtained, whereas if the content exceeds 0.2% by weight, the This is based on the reason that when the wood is taken out into the atmosphere, excess triazole compounds remain as white marks, impairing its commercial value. Next, the surface treatment agent of the present invention will be specifically explained with reference to Examples.

Surface treatment agent 1 of the present invention having the composition shown in Table 1
- 16, two types of steel pipes with different dimensions (outer diameter 6 skin x wall thickness 0.7 leg and outer diameter 9.53 skin x wall thickness 0.35 side) separately manufactured by continuous drawing were immersed. After crushing and bonding, a total of 50 of the copper tubes, 25 each, were bundled and subjected to a hammering process at a temperature of 650 qo in a reducing atmosphere.

As a result, no close bonding was observed between the parts treated with the invention surface treatment agents 1 to 16 in Table 1 of the present invention after the light purification process, and the luster of the parts was not lost even after two hours had elapsed. There wasn't.

In addition, in steel pipes that were not subjected to surface treatment, close contact occurred in some of the thin walls, and the color changed to amber color after 24 hours. In addition, the coefficient of friction (average of 100 specimens) was measured for the annealed steel pipes treated with the above-mentioned surface treatment agents 1 to 16 of the present invention. A fog test was conducted to observe the appearance of surface discoloration.

The results are also shown in Table 1. Furthermore, for the purpose of comparison, Table 1 shows the friction coefficient and surface discoloration of the above-mentioned steel pipes without surface treatment. As is clear from the results shown in Table 1, compared to steel pipes without surface treatment, the steel pipes treated with the surface treatment agent of the present invention have a lower coefficient of friction and extremely good sliding properties between the steel pipes. Moreover, even after the fogging test, almost no surface discoloration was observed, and the shiny state was maintained.

Furthermore, regarding the steel pipes treated with the above-mentioned surface treatment agent of the present invention, soft solder (Sn-5%Ag) and hard solder (BAg-4
, BCuP-3, BCuP-2) were tested for brazing properties and fluidity, and the results were very good.

As described above, the surface treatment agent of the present invention can simultaneously degrease and clean the surfaces of copper and copper alloy members, prevent close bonding between the members during annealing, and prevent the members from forming a close bond after annealing. It prevents discoloration of the surface, ensures good slipperiness, and forms a protective film on the surface of the component, so pretreatment for annealing can be shortened and the component can be easily handled after moth annealing. This brings about industrially useful effects such as a marked improvement in product yield.

Claims (1)

[Claims] 1 Petroleum solvents or chlorinated hydrocarbon solvents have general formulas: ▲ Numerical formulas, chemical formulas, tables, etc. ▼ (In the above formula, R is an alkyl group having 1 to 8 carbon atoms. or aryl group, and n represents an integer of 1 to 100): 0.05 to 1.0% by weight
A surface treatment agent for copper and copper alloy members, characterized in that it contains the following. 2 Petroleum solvents or chlorinated hydrocarbon solvents have general formulas: ▲mathematical formulas, chemical formulas, tables, etc.▼ (In the above formula, R represents an alkyl group or an aryl group having 1 to 8 carbon atoms, (n represents an integer of 1 to 100): 0.05 to 1.0% by weight
and a triazole compound: 0.01 to 0.2% by weight. A surface treatment agent for copper and copper alloy members.