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„Ochrona przed Korozją” (Corrosion Protection) No. 12/2015

View cover and table of contents (in Polish and English) (pdf)

 

DOI: 10.15199/40.2015.12.1

Discharge capacity and hydrogen electrosorption kinetics of La2Ni9CoM0,2 (M = Al, Ce, In or Sn) alloys

Adamczyk L.

Giza K.

Bala H.

Division of Chemistry, Faculty Production Engineering and Materials Technology,

Czestochowa University of Technology, al. Armii Krajowej 19, 42-200 Czestochowa, Poland

Drulis H.

Institute of Low Temperatures and Structure Research PAS, Wroclaw, Poland

The electrochemical characteristics of the La2Ni9CoM0,2 (M = Al, Ce, In or Sn) alloys, including the discharge capacity, the H2O/H2 exchange current density, and the high rate discharge ability of the alloys were studied as functions of cycling. The galvanostatic and potentiostatic techniques were used to estimate the discharge capacity and hydrogen electrosorption kinetics for La2Ni9CoM0,2 alloys. Particularly hopeful are the discharge capacities of the alloys: La2Ni9CoSn0.2 and La2Ni9CoAl0.2 (on the level of 330 mA·h·g-1 / at discharge current density of 185 mA·g-1). The La2Ni9CoAl0.2 and La2Ni9CoCe0.2 alloys are the most resistant to high rate discharge rates but their HRD noticeably decreases at discharge rates exceeding 600 mA·g-1.

Keywords: hydrogen storage, discharge capacity, exchange current, HRD

2015

Vol. 58, nr 12

s. 443-445

Ref. 24

 


 

DOI: 10.15199/40.2015.12.2

Nitrided layers on unalloyed steels with an enhanced corrosion resistance

Wach P

Michalski J.

Burdyński K.

Institute of Precision Mechanics, Duchnicka 3, 01-796 Warsaw

The paper presents nitrided layers on C10 steel and their corrosion properties. Nitrided layers with a surface layer of iron nitrides with the γ’ (Fe4N) structure were formed on unalloyed steel upon which their investigation was performed. The Surface layers of iron nitrides had a thickness of 3.0 to 11.0 μm. Such layers may constitute an alternative for the hitherto industrially manufactured, thick-surface layers of nitrides exceeding 20 μm, subsequently oxidised and impregnated. The so-produced layers were subject to basic metallographic, X-ray crystallography and corrosion resistance testing carried out using electrochemical methods and in a neutral salt spray chamber. It was found that the layers consisting exclusively of γ’ phase had a good corrosion resistance. A complete tightness and thickness of the layers not lower than 9.0 μm is a prerequisite for achieving an

enhanced resistance. Thinner layers demonstrated good electrochemical properties however they did not exhibit corrosion resistance

in the salt spray chamber.

Keywords: nitriding, corrosion resistance, iron nitrides

2015

Vol. 58, nr 12

s. 447-450

Ref. 8

 


 

 DOI: 10.15199/40.2015.12.3

Corrosion and wear behavior of nitrocarburized layer on 42CrMo4 alloy steel formed in the new type of fluidized bed thermo-chemical treatment

Ciski A.

Wojucki M.

Institute of Precision Mechanics, Duchnicka 3, 01-796 Warsaw

In order to improve the service life and functionality of various structural steel components such as gear wheels, toothed rollers, crankshafts, etc., which are subjected to tribological and corrosion impact, a thermo-chemical treatment such as nitrocarburizing is recommended. The aim of the paper is to present the properties of nitrocarburized layers formed on 42CrMo4 alloy steel by the new type of fluidized bed thermo-chemical treatment which is carried out in chemically active powders. Presented method combines the most important advantages of the box and atmospheric fluidized-bed methods. The source of carbon and nitrogen elements is based on a powder mixture of active carbon and the potassium ferrocyanide. Chemically active bed is fluidized by forced vibrations resulted from mechanical vibrations which are subjected to retort. The paper presents corrosion and wear resistance of 42CrMo4 steel after the new method of nitrocarburizing. The results of studies show positive influence of the presence of a thin iron carbonitrides layer formed during nitrocarburizing. Corrosion resistance test performed in a neutral salt spray atmosphere showed increased corrosion properties of steel after such treatment. Thermo-chemically treated samples revealed the first signs of corrosion after 72 hours of test. Wear test carried out in a 3 rollers-cone system showed above 3 times lower wear in comparison with steel after basic heat treatment.

Keywords: nitrocarburizing, fluidized bed, chemically active powder, corrosion resistance, wear

2015

Vol. 58, nr 12

s. 451-454

Ref. 7

 


 

Corrosion protection in practice

DOI: 10.15199/40.2015.12.4

Passive fireproof coatings: mechanism of action, physical and chemical processes in fire

GŁĘBOWICZ A.

International Paint Sp. z o.o., Gdańsk

Basic components of fireproof products, including fire retardant, cementitious based and intumescent, and their mechanism of action in fire has been described.

Keywords: fireproof protection, mechanism of action

2015

Vol. 58, nr 12

s. 456-459

Ref. 11

 


 

Corrosion protection in practice

DOI: 10.15199/40.2015.12.5

The critical factors associated with application of intumescent paint systems

Gajecka I.

PPG Coatings Poland Sp. z o. o., Gdynia

Main goal of this presentation is to point out important technological parameters which have to be kept to obtain the operation properties of intumescent fire protection coatings. It contains application rules, criteria of acceptance and solution for specific steel sections, mainly based on the recommendations of ASFP (Association for Specialist Fire Protection, UK). It also consists of description of basic relationships between properly designed, applied and used fire protection coating system and expected durability of protection declared by manufacturer in the context of corrosion and fire protection.

Keywords: fire protection systems for structural steelwork, intumescent paint

2015

Vol. 58, nr 12

s. 460-464

Ref. 11