Corrosion Resistant Patents (Class 165/DIG513)
  • Absorption refrigerator and production method thereof
    Patent number: 5964103
    Abstract: An absorption refrigerator uses water as a refrigerant and a halogen compound as an absorption solution, and is characterized in that an oxide film of thickness of 0.02-5.0 .mu.m is formed on a surface of at least one of a heat exchanger and a high temperature regenerator. And a production method of the absorption refrigerator is characterized by oxidizing a surface of at least one of a heat exchanger and a high temperature regenerator at a temperature of 200-800.degree. C., and adjusting a heating temperature and a heating retaining time so that a value of parameter (P), obtained according to P=T (5+log t) is 3.5-6.0.times.10.sup.3, wherein T represents heating temperature (.degree.K), and t heating retaining time (minute).
    Type: Grant
    Filed: June 19, 1998
    Date of Patent: October 12, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Katsumi Mabuchi, Heihatiro Midorikawa, Tomoko Kikuchi, Takashi Honda, Michihiko Aizawa, Masahiko Ito
  • Absorption refrigerator and production method thereof
    Patent number: 5806337
    Abstract: An absorption refrigerator uses water as a refrigerant and a halogen compound as an absorption solution, and is characterized in that an oxide film of thickness of 0.02-5.0 .mu.m is formed on a surface of at least one of a heat exchanger and a high temperature regenerator. And a production method of the absorption refrigerator is characterized by oxidizing a surface of at least one of a heat exchanger and a high temperature regenerator at a temperature of 200.degree.-800.degree. C., and adjusting a heating temperature and a heating retaining time so that a value of parameter(P), obtained according to P=T (5+log t) is 3.5-6.0.times.10.sup.3, wherein T represents heating temperature (.degree.K), and t heating retaining time (minute).
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: September 15, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Katsumi Mabuchi, Heihatiro Midorikawa, Tomoko Kikuchi, Takashi Honda, Michihiko Aizawa, Masahiko Ito
  • Corrosion resistant heat exchanger and method of making the same
    Patent number: 5732767
    Abstract: Inconsistent and costly corrosion protection with prior art heat exchangers are eliminated in a heat exchanger (10) formed of an aluminum fin (16) clad with an Al--Si--Zn braze clad compound (18), an aluminum tube (14) brazed to the fin (16), and bonded thereto by the braze clad compound (18) with zinc diffused into the tube, whereby the aluminum tube (14) is corrosion resistant by reason of the presence of sacrificial zinc therein.
    Type: Grant
    Filed: January 24, 1996
    Date of Patent: March 31, 1998
    Assignee: Modine Manufacturing Co.
    Inventor: Zalman Philip Saperstein
  • Plate fin heat exchanger and method of making thereof
    Patent number: 5699855
    Abstract: To prevent with certainty corrosion by mercury even in nonoperating of plant facilities, plate fins 1 and flat plates 2 of flow passage members constituting cooled fluid passages and refrigerant passages are formed by an aluminum alloy and on surfaces of the plate fins 1 and the flat plates 2, an oxide film formed by a reaction between the aluminum alloy and an oxidizing component in an oxidizing gas is formed, or a hydroxide film formed by a reaction between the aluminum alloy and an alkaline component in an alkaline aqueous solution is formed.
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: December 23, 1997
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventor: Kenichiro Mitsuhashi