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缇庡湅閫插彛TAFA閹冲熀闆诲姬鍣存秱绲睺AFALOY 45CT绲叉潗
缇庡湅閫插彛TAFA閹冲熀闆诲姬鍣存秱绲睺AFALOY 45CT绲叉潗
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    缇庡湅閫插彛TAFA閹冲熀闆诲姬鍣存秱绲睺AFALOY 45CT绲叉潗

    闄滆タ瑗垮畨椐跨剨閵峰敭缇庡湅閫插彛TAFA閹冲熀闆诲姬鍣存秱绲�

    A high chromium content nickel alloy, Tafaloy 45CT, was developed to combat corrosion in high temperature sulfurous environments. The alloy is applied by arc thermal spraying at thicknesses of 15-20 x 10{sup -3} in (381-508 {mu}m) onto surfaces such as water wall tubes in black liquor recovery boilers. The coating has a bond strength of 6500 lbf in{sup -2} (44.82 MPa) and is well matched to the thermal expansion characteristics of steels used for boiler tube construction. Analysis of the coating indicates the presence of two solid solutions of chromium in nickel and two chromium oxides. The major component of the bllic phases is the high chromium (44%) bulk material. The other components are a small portion of the coating. Coatings in service for 18 months show surface sulfur concentrations amounting to only 1%. The sulfur is effectively blocked from more penetration by combining with the chromium and the bation of a self healing chromium oxide film on the coating's surface and within the pores with access to the atmosphere. The coating remains well bonded and protective. Coatings have been in service for over four years without failing. (orig.).
    Authors:
    Zanchuk, W [1] 
     Hide Author Affiliations
    1. TAFA, Inc., Concord, NH (USA)
    Publication Date:Dec 01, 1989

    Product Type:Conference
    Report Number:CONF-890468-
    Reference Number:CHF-90-0F0078; EDB-90-060512
    Resource Relation:Journal Name: Surface and Coatings Technology; (Switzerland); Journal Volume: 39/40:1-3,pt.1; Conference: 16. international conference on bllurgical coatings and equipment exhibit, San Diego, CA (USA), 17-21 Apr 1989
    Subject:36 MATERIALS SCIENCE; CHROMIUM ALLOYS; CORROSION PROTECTION; PROTECTIVE COATINGS; NICKEL BASE ALLOYS; TITANIUM ADDITIONS; ADHESION; BOILERS; CHEMICAL COMPOSITION; CHROMIUM; CHROMIUM OXIDES; HIGH TEMPERATURE; IN-SERVICE INSPECTION; MICROSTRUCTURE; NICKEL ALLOYS; PLASMA ARC SPRAYING; SOLID SOLUTIONS; SPRAYED COATINGS; SURFACE COATING; THERMAL EXPANSION; TUBES; WATER; X-RAY DIFFRACTION; X-RAY EMISSION ANALYSIS; ALLOYS; CHALCOGENIDES; CHEMICAL ANALYSIS; CHROMIUM COMPOUNDS; COATINGS; COHERENT SCATTERING; CRYSTAL STRUCTURE; DEPOSITION; DIFFRACTION; DISPERSIONS; ELEMENTS; EXPANSION; HYDROGEN COMPOUNDS; INSPECTION; METALS; MIXTURES; NONDESTRUCTIVE ANALYSIS; OXIDES; OXYGEN COMPOUNDS; SCATTERING; SOLUTIONS; SPRAY COATING; TITANIUM ALLOYS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; 360105* - Metals & Alloys- Corrosion & Erosion; 360101 - Metals & Alloys- Preparation & Fabrication
    OSTI ID:7198597
    Country of Origin:Switzerland
    Language:English
    Other Identifying Numbers:Journal ID: ISSN 0257-8972; CODEN: SCTEE
    Submitting Site:HEDB
    Size:Pages: 65-69
    Announcement Date:May 01, 1990

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