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Composition and method for controlling galvanic corrosion in printed circuit boards

A technology of printed circuit boards and compositions, applied in the direction of printed circuits, printed circuit manufacturing, manufacturing tools, etc., can solve the problems of accelerated corrosion, high failure rate, etc.

Inactive Publication Date: 2010-10-06
MACDERMID INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Higher failure rates and accelerated corrosion are seen in environments with high levels of reducing sulfur gases such as elemental sulfur and hydrogen sulfide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] In general, the present invention relates to an aqueous anticorrosion coating composition comprising:

[0034] a) mercaptans;

[0035] b) preferred ethoxylated alcohols; and

[0036] c) at least one metal ion species selected from the group consisting of molybdate, tungstate, vanadate, zirconium, cobalt and titanium.

[0037] In an optional but preferred embodiment, the anti-corrosion coating composition further comprises xanthan gum. The concentration of xanthan gum, if used, is preferably from 1 to 10 grams per liter.

[0038] The ethoxylated alcohol is preferably an ethoxylate of a C-10 alcohol. However, other similar ethoxylated alcohols are known to those skilled in the art and may be used in the present invention. If used, the concentration of ethoxylated alcohol is preferably from 0.1 to 10 g / l.

[0039] In addition, a variety of thiols can be used in the compositions of the present invention, including, for example, thiols with chain lengths of C12 to C18. ...

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PUM

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Abstract

A composition for inhibiting the galvanic corrosion of printed circuit boards. The corrosion resistant coating composition may be applied to the printed circuit board to reduce corrosion and to shut down the chemical mechanism for galvanic corrosion so that corrosion protection of the product is achieved. The corrosion resistant coating composition comprises a) a mercaptan; b) an ethoxylated alcohol; and c) at least one metal species selected from the group consisting of molybdates, tungstates, vanadataes, zirconium, cobalt.

Description

technical field [0001] The present invention relates to an aqueous anticorrosion coating composition for reducing corrosion on the surface of printed circuit boards. Background technique [0002] Manufacturing methods for printed circuit boards (PCBs) often include many steps, partly because of the increased need for enhanced functionality. The surface circuitry on a PCB typically includes copper and copper alloy materials that are coated to provide good mechanical and electrical connections to other devices in the assembly. In the manufacture of printed circuit boards, the first stage involves preparing the circuit board and the second stage involves mounting various components on the circuit board. [0003] There are generally two types of components that can be attached to a circuit board: a) pin components, such as resistors, transistors, etc., which are made by inserting each pin into a hole in the board, and then securing the pins around the pins. and b) surface moun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/12B32B3/00C09D7/80
CPCH05K2203/121H05K2203/122C23F11/161H05K3/282C23C22/40C23F11/10C23F11/173B23K35/3613
Inventor E·朗A·克罗尔L·M·托斯卡诺S·A·卡斯塔尔迪
Owner MACDERMID INC