steel on which it would deposit the stray currents and hence the corrosion CHROMIUM due to them. exogenic rust, seriously marring its surface finish. Providing that these This is reported, without any sig Effect of ultrasonics on electro- points are obeyed, stainless steel gives nificant further details in Ekonomic- deposition excellent service in maritime atmo heskaya Gazeta, March 12,1962, 11, 45. Ultrasonics have no appreciable spheres.—(J.-M. Defranoux, Corr. et effect on the electrochemical reduction Anticorr., 1962, 10 (3), 86-92.) of Cr6+ to Cr0, but aid and accelerate FOOD CONTAINERS that of Cr6+ to Cr3+ and of 2H+ to The causes of alterations in canned H . The electrodeposition of chro SCALE food containers mium in an ultrasonic field is accom panied by an inconsiderable reduction The investigation covered the mac Causes of formation (lower current density) and an increase roscopic and microscopic evaluation Continuous operation of many (higher current density) in the catho- as well as the determination of cor appliances is impeded by scale forma dic current yield. The suggestion is rosion damage by means of the tion which is most frequently encoun confirmed that the reduction of chromatographic printing method tered on heat-transmitting surfaces. chromic acid to metal proceeds from according to Hutschreuter. As these This item deals with crystalline scale substances entering into the com investigations have demonstrated, the formed by dissolved substances in position of a 'movable ' cathodic film, printing method makes it possible to metallic materials. the reduction of which is facilitated differentiate accurately between marb A theoretical section, dealing with by their adsorbed state. A fairly ling and corrosion, as it is based on the influence on scale formation of extensive review of relevant literature the detection of iron sulphide. It has such factors as pressure, temperature, is given, with 35 references, including been established that goulash, pork extraneous matter, flow velocity and effect on lowered potential in water and fat pork preserves are particularly condition of the solid surface, is dissociation, reduced hydrogen over- prone to corrosion because of their followed by the description of experi voltage on polarisation curves, etc. In content of sulphur compounds and mental investigations. the present work special attention has free fatty acids. The use of lacquered The phenomenon investigated as a been given to current yields in the cans reduced the interaction between model is the crystallisation in radio- case of chromium oxides and chromic container material and contents to a actively marked CaSO solutions (Ca45 acid, with micro-photographs of the great extent.—(R. Mossdorf, Fleisch- and S35, respectively). The experi oxide surface.—(A. M. Ozerov, Zh. wirtschaft, June 1960, 12, 443-446.) ments show, in keeping with the prikl. Khim., 1962, (1), 115-122.) Translated into English by the British theory, that macroscopic scale can only Iron and Steel Industry Translation appear when the solution is over- Service, No. 2209. saturated. There are no essential STAINLESS STEEL differences between corrosive and non- corrosive materials. The formation of CONDENSATION In sea air blisters on the solid surface tends to Dependence of condensation on A discussion on the value of stainless promote scale formation. In this con properties of material tested in 18/8 steel in maritime surroundings nection, the roughness of the solid cabinet has led to the following recommenda surface is likewise of importance.— tions. Either the plain, or the molyb Condensation in the tester cabinet (L. Junghahn, Werks. u. Korr., 1962, denum-containing, stainless 18/8 steel proceeds in principle as follows: (a) 13, 143-150.) is an excellent structural material Rapid increase to a first maximum, under conditions of service on a sea which depends on the tested material shore. Its mechanical qualities remain and, in the case of the same material, MEASURING unimpaired, yet the surface finish may on the thickness of the test piece. Stray currents and corrosion suffer in time. Stainless steel should (b) Slowly rising undulated curve, the therefore always be used in a vertical The Academy of Sciences of the maxima of which coincide with the position when the action of rain will U.S.S.R. Institute of Electrochemistry temperature on the surface of the test wipe it clean of any salt or other piece and those of the period of regula and the Academy of Communal deposits. Stainless steel should not be tion. The rate of increase is hardly Economy have developed a simple and used in a horizontal position for that highly sensitive measuring and in dependent on the material and its reason. The design should be such tegrating device for minute currents. thickness. The amplitude of the waves that the formation of small recesses is This is based on the 'electrochemical increases with increasing heat capacity safely prevented where atmospheric rectifiers' developed by the first of the material. corrosive agents could remain active organisation, which operate at 20 to Condensation is stronger on metal for long periods. 'Exogenic rust' 30 mV, and 'electrochemical in than on glass and organic coatings; must not be allowed to be deposited tegrators', which integrate small cur stronger on zinc than on cadmium. on stainless steel. By this is meant rents. The devices, already in experi No influence of the roughness of that water, having had previous con mental production by the Krasnodarski the surface could be detected. The tact with ordinary steel when it might zavod izmeritel 'nykh priborov, are to influence of the material in the con have caused the formation and dis be buried along buried pipelines, etc. densation confirms previous results by solution of rust, should be prevented In the light of what they show, counter Tammann.—(A. Kutzelnigg, Werks. from coming in contact with stainless voltages will be applied to stop the u. Corr., 1962, 13, 151-157.) 188 CORROSION TECHNOLOGY July 1962
Anti-Corrosion Methods and Materials – Emerald Publishing
Published: Jul 1, 1962
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