JPS57134567A - Formation of iron oxide film on inside of condensing pipe made of copper alloy - Google Patents

Formation of iron oxide film on inside of condensing pipe made of copper alloy

Info

Publication number
JPS57134567A
JPS57134567A JP2033581A JP2033581A JPS57134567A JP S57134567 A JPS57134567 A JP S57134567A JP 2033581 A JP2033581 A JP 2033581A JP 2033581 A JP2033581 A JP 2033581A JP S57134567 A JPS57134567 A JP S57134567A
Authority
JP
Japan
Prior art keywords
soln
oxide film
iron oxide
powder
acidic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2033581A
Other languages
Japanese (ja)
Inventor
Toshio Fukuzuka
Kazutoshi Shimogoori
Etsuo Yamamoto
Kenji Miki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP2033581A priority Critical patent/JPS57134567A/en
Priority to US06/256,121 priority patent/US4369073A/en
Priority to DE8181301837T priority patent/DE3166557D1/en
Priority to EP81301837A priority patent/EP0039228B1/en
Publication of JPS57134567A publication Critical patent/JPS57134567A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To form a uniform thin anticorrosive iron oxide film with high adhesion on the inside of a condensing pipe by blowing air into an acidic soln. contg. iron powder to oxidize the powder and to make it fine, coating the inside of the pipe with the soln., and drying the soln.
CONSTITUTION: To an acidic soln. such as about 0.1W2.0N hydrochloric acid is added about 100W5,000g/l iron powder. The grain size of the iron powder is <400mesh. Part of the powder is dissolved in the soln., yet most of it is suspended. About 1W50ml/min.cm3 wet air is then blown into the prepared acidic liq. for about 0.5W4hr at ordinary temp. or an elevated temp. By this preliminary oxidation the iron powder is acceleratedly made fine to enhance the uniformity of a film. The inside of a condensing pipe is coated with the acidic liq. and allowed to stand in air to form a thin anticorrosive iron oxide film with superior adhesion and uniformity in a short time. At this time, it is more effective to blow wet air.
COPYRIGHT: (C)1982,JPO&Japio
JP2033581A 1980-04-25 1981-02-13 Formation of iron oxide film on inside of condensing pipe made of copper alloy Pending JPS57134567A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2033581A JPS57134567A (en) 1981-02-13 1981-02-13 Formation of iron oxide film on inside of condensing pipe made of copper alloy
US06/256,121 US4369073A (en) 1980-04-25 1981-04-21 Method for protecting the inner surface of a copper alloy condenser tube from corrosion
DE8181301837T DE3166557D1 (en) 1980-04-25 1981-04-27 Method for protecting the inner surface of a copper alloy condenser tube from corrosion and a copper alloy condenser tube protected thereby
EP81301837A EP0039228B1 (en) 1980-04-25 1981-04-27 Method for protecting the inner surface of a copper alloy condenser tube from corrosion and a copper alloy condenser tube protected thereby

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2033581A JPS57134567A (en) 1981-02-13 1981-02-13 Formation of iron oxide film on inside of condensing pipe made of copper alloy

Publications (1)

Publication Number Publication Date
JPS57134567A true JPS57134567A (en) 1982-08-19

Family

ID=12024261

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2033581A Pending JPS57134567A (en) 1980-04-25 1981-02-13 Formation of iron oxide film on inside of condensing pipe made of copper alloy

Country Status (1)

Country Link
JP (1) JPS57134567A (en)

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