420 Comprehensive papers covering several materials groups

Korrosions- und Werkstoff- priifung

Arbeiten uber mehrere Werk- stoffgruppen several materials groups

Corrosion and materials testing

Camprehensive papers covering

Werkstoffe und Korrosion 29, 420-423 (1978)

Nichtmetallische anorganische Non-metallic inorganic materials Werkstoffe

Kunststoffe und andere Plastics and other organische Werkstoffe organic materials

Metallische iiberzuge Metal coatings

International Corrosion Abstracts mit den Untergruppen

Eisenmetalle Ferrous metals Nichtmetallische anorganische Non-metallic inorganic tjberziige coatings

Nichteisenmetalle Non-ferrous metals Organische Uberzuge Organic coatings

Diese Rubrik enthiilt Referate ausgewalter Fortschrittsberichte und Ubersichtsartikel, die in enger Zusammcnarbeit unserer Redaktion mit Metals Abstracts (The American Society for Metals and The Metals Society, London) entstehen. Leser, die die hier referierten Arbeiten in vollem Wortlaut zu erhaltcn wunschen, werden gebeten, sich an eine in ihrer Nahe gelegene Bibliothek zu wenden. Einen Schlussel zu den ab- gekurzten Quellenangaben bietet der ,,Bibliographic Guide for Editors and Authors", der vom Verlag Chemie bezogen werden kann.

This column contains abstracts of selected progress reports and review articles which arise out of ow close collaboration with Metals Abstracts. Readers wishingto obtain the complete text of articles abstracted io this section are requested to approach a local library. A key to abbreviated source lists is provided in the Bibliographic Guide for Editors and Authors, published by Chemical Abstracts Service, Columbus, Ohio 43210, U.S.A.

Korrosions- und Werkstoffpriifung/ Corrosion and materials testing

1154 Determination of the Corrosion Rate of Steel in Fresh Water from the Data of Polarization Measurements. Yu.A. Kharlamov,V. F. Knyazeva, A. N. Syur, and G.V . Khaldeev. Korroz. Zashch.,1977,(5), 7-11 [in Russian].

To investigate the use of polarization data to determine the corrosion rate of steel in fresh waters, tes ts were made with steel St3 (contg. C 0.14-0.22"/0) using stationary and spinning-disc specimens with galvanostatic and potentiodynamic polarization. Test solutions were obtained from river waters, contg. various concentrations of Ca and Mg ions and NaCl,NaHCO,,CaCl,,and MgSO,,with pH 7.0-8.5,at 17-20 "C. Four methods for the determination of corrosion rates were compared: (i) weight-loss, (ii) extrapolation of Tafel slopes to the corrosion potential, (iii) limiting diffusion current for 0 reduction, and (iv) a modified Stern-Geary method. Best agreement with gravi- metric results (i) is given by method (ii) . Method (iv) can be used for static conditions but agreement with ( i ) i s not good in moving condi- tions. The effects uf salt deposition and dissolved-0 content on results with method ( i i i ) a re discussed.-A.D. M .

1155 The Saturated Vapour Pressure of Lolatile Corrosion Inhibit- ors. 0. I. Golyanitskii. Zashch,geL, Sept. -0ct. 1977.13, (5). 542-548 [in Russian].

Errors and irregularities i n published data on saturated v.p. values of volatile corrosion inhibitors a re discussed. A modification of the method originally due to J . Stefan i s described. This is based upon a weight determination of the rate of evaporation from a cylindrical con- tainer, the mechanism being discussed in detail. Saturated v.p. values of a number of inhibitors are tabulated. 28 ref.-!.. D. M.

Arbeiten uber mehrere Werkstoffgruppen/ Comprehensive papers covering several materials groups

1156 C-141A Service ExperienceMater ia ls and Processes. Larry D. Griffin. Materials and Processes in Service Performance 1977,445-456 (M-, 7802-72 0025) [in

Several years have elapsed since the first C-141A aircraft was delivered to the U.S. Air Force. The significant materials and processes related service experience is discussed and examples a r e given. The data were gathered from official records maintained at the Warner Robins Air Logistics Center and Lockheed-Georgia Co. Specifically the performance of the parts from 7075 and 7079 A1 alloys and 4340 steel and of honeycomb struc'dres i s evaluated.-AA

Englishj.

1157 Corrosion Behavior of Doped Tungsten Metallized Wire Towards Alminum, Nickel and Chromium. R. Eck, P. Kienzl, B: Tiles,H. Wagner and 0. Briem. 9th Plansee Seminar (I), 1977, P p 15 (Met. A., 7802-72 0021) in German].

T u n g s t e n m m m dia.) was dippedin molten matali at 1500-1900 "C for 5-50 s. The dia. of the wire decreased rapidly. The severity of the attack (in increasing sequence) is by C r (1900"), A1 (1500"),Ni (1500n),Ni20Cr (1900").-F. G. N.

1158 Durability of Adhesive Bonded Honeycomb Sandwich in Accelerated Adverse Environments. D. Robert Askins and H. S. Schwartz. Materials and Processes in Service Performance 1977,329-350 (Met.A., 7802-72 0025) [in EKgizq-'

The environmental degradation of various types of honeycomb core sandwich constructions was investigated. The constructions included combinations of Al and plastic core materials with Al, graphite composite and fiberglass composite skins and various types of adhesives. The objectives of the investigation were to assess: the degree of improvement in durability of new, corrosion resistant A1 (5052) over the untreated type; the significance of the adhesive on interfacial durability; possible adverse galvanic corrosion of A1 honeycomb bonded to graphite composite skins; and comparative durability of A1 vs. plastic honeycomb. Analysis of the results established the significance of environmental degradation upon the various skin/core/adhesive combinations and assessed the existence and extent of synergistic interactions between the various structural constituents and the environmental factors.--AA

1159 Potential Distribution in a Corroding Pit. John Newman, D. N. Hanson, and K. Vetter. Electrochim. Acta, Aug. 1977, 22, (8), 829-831 [in English].

A quant. solution of potential distribution in hemispherical corrosion pits is presented. The problem is complicated by the discontinuity in surface flux at the edge of the pit. The flux normal to the surface inside the pit can be assumed constant over the whole surface since the pit remains hemispherical during corrosion. However, at the pit edge the normal flux is abruptly reduced to zero, and the planar sur- face acts essentially a s an insulator.-BA

1160 Dewatering [Damp-Proofing] Fluids for Protecting Semi- Finished Products from Corrosion. M. Rochette. CE. s., Nov.-Dec. 1976,7, (6), 359-364 [in Spanish]. (Received 1977)

Dewatering [damp-proofing] fluids provide an effective means of pro- tecting semi-finished metal products from atmospheric corrosion during intermediate stages in production and in storage. The import- ant factors in assessing the performance of such products are;de- wetting ability, speed of drying, protection against humid atmospheres, film thickness, longevity, and ease of removal. Suitable tes ts to assess these factors a r e described and equipment layouts are given f o r typical plant for application of the fluids by immersion or spraying.

D.B.