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Carbon Indicator for Steel

IP.com Disclosure Number: IPCOM000049130D
Original Publication Date: 1982-May-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Emerick, AJ: AUTHOR [+2]

Abstract

If copper plating on a workpiece is defective when used as a carbon barrier for case hardening, the steel under the defect will become a hard spot. This spot may cause difficulty in later processing, necessitating scrapping of the workpiece. The following is a chemical method of visually determining the relative carbon level of the steel parts. Carbonized areas become dark when immersed in the indicator solution. The process steps are as follows: 1. Parts are degreased. 2. Parts are immersed in an indicator solution five seconds. This solution comprises 237 g of chrome oxide, 56 of sulfuric acid, 137 ml of hydrochloric acid, and 1,000 ml of water. 3. Parts are then washed in water. 4.

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Carbon Indicator for Steel

If copper plating on a workpiece is defective when used as a carbon barrier for case hardening, the steel under the defect will become a hard spot. This spot may cause difficulty in later processing, necessitating scrapping of the workpiece. The following is a chemical method of visually determining the relative carbon level of the steel parts. Carbonized areas become dark when immersed in the indicator solution. The process steps are as follows: 1. Parts are degreased.

2. Parts are immersed in an indicator solution five

seconds. This solution comprises 237 g of chrome

oxide, 56

of sulfuric acid, 137 ml of hydrochloric acid, and

1,000 ml of water.

3. Parts are then washed in water.

4. Thereafter, parts are immersed

cleaning etch which comprises 10 g of copper sulfate,

50 ml of

hydrochloric acid and 50 ml of water.

5. The parts are then washed in water, dried and

inspected.

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