Korrosion

1.1 This part of ISO 11782 describes the fracture mechanics method of determining the crack growth rates of pre-existing cracks under cyclic loading in a controlled environment and the measurement of the threshold stress intensity factor range for crack growth below which the rate of crack advance falls below some defined limit agreed between parties.
1.2 This part of ISO 11782 provides guidance and instruction on corrosion fatigue testing of metals and alloys in aqueous or gaseous environments.

This document defines terms relating to corrosion that are widely used in modern science and technology. In addition, some definitions are supplemented with short explanations.
NOTE 1 Throughout the document, IUPAC rules for electrode potential signs are applied. The term “metal” is also used to include alloys and other metallic materials.
NOTE 2 Terms and definitions related to the inorganic surface treatment of metals are given in ISO 2080.

This standard specifies an aerosol spray method for testing the corrosivity of disinfectants against metallic materials. The test method involves the cyclic exposure of test specimens to a mist of disinfectant and to a ventilation condition. After the cycles, the specimens are studied to identify if there is a change in mass, or changes to the specimen surface. This standard provides details on the instruments, reagents, preparation and pretreatment of the test specimens, test conditions, test methods, calculation of corrosion rate, reports, etc.
A feature of this standard is a corrosion test method which can stimulate the situation of metal materials exposed to the real disinfection environment. This standard is applicable to the determination of corrosion of disinfectant aerosol spray to metal materials.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

This document specifies procedures for designing, preparing and using precracked specimens for investigating susceptibility to stress corrosion. It gives recommendations for the design, preparation and use of precracked specimens for investigating susceptibility to stress corrosion. Recommendations concerning notched specimens are given in Annex A.
The term "metal" as used in this document includes alloys.
Because of the need to confine plasticity at the crack tip, precracked specimens are not suitable for the evaluation of thin products, such as sheet or wire, and are generally used for thicker products including plate bar and forgings. They can also be used for parts joined by welding.
Precracked specimens can be loaded with equipment for application of a constant load or can incorporate a device to produce a constant displacement at the loading points. Tests conducted under increasing displacement or increasing load are dealt with in ISO 7539-9.
A particular advantage of precracked specimens is that they allow data to be acquired, from which critical defect sizes, above which stress corrosion cracking can occur, can be estimated for components of known geometry subjected to known stresses. They also enable rates of stress corrosion crack propagation to be determined. The latter data can be taken into account when monitoring parts containing defects during service.

This document defines a laboratory accelerated corrosion test method in two closely related variants.
They are used in assessing the corrosion resistance of metals in environments where there is a significant influence of chloride ions, mainly as sodium chloride from e.g., winter road de-icing salt.
The test variants contain humidity dynamics in proportions found in outdoor environments affected by corrosion and are balanced to receive realistic proportions of corrosion rates between various commonly occurring materials, coatings and engineering designs. The results obtained do not
permit far-reaching conclusions on the corrosion resistance of the tested metallic material under the whole range of environmental conditions in which it may be used. Nevertheless, the method provides information on the relative corrosion resistance of a material exposed to a salt-contaminated
environment with varying humidity conditions. The two accelerated laboratory corrosion test variants are applicable to:
— metals and their alloys (ferrous and non-ferrous);
— metallic coatings;
— chemical conversion coatings;
— organic coating on metals;
— a combination of materials and coatings that include galvanic interactions and/or crevice conditions.
NOTE 1 If testing low-alloy stainless steels according to this document, especially austenitic grades, there is a risk of receiving exaggerated pitting, not representative for most service environments.
NOTE 2 This document is not suitable for testing of wax and oil-based rust protection agents, due to the constantly elevated temperature condition of the test.
NOTE 3 This document does not specify the dimensions of the tests specimens, the exposure period to be used for a particular product, or the interpretation of the results. Such details are provided in the appropriate product specifications.

This document specifies the general requirements, test unit parameter design, operation parameters, water quality and contamination, parameters to be evaluated in pilot test units, design and operation of pilot test device, etc., to be followed in the pilot test evaluation of corrosion and scaling additives in open circulation cooling water systems.
This part of ISO 16784 covers the criteria that must be defined and implemented in a pilot scale testing programme to select water treatment programmes for use in specific recirculating cooling water systems.
This part of ISO 16784 covers only open recirculating cooling water systems. Closed cooling systems and once through cooling water systems are specifically excluded.
This part of ISO 16784 applies only to systems incorporating shell and tube heat exchangers with standard uncoated smooth tubes and cooling water on the tube side. Heat exchangers with shell side water, plate and frame and/or spiral heat exchangers, and other heat exchange devices are specifically
excluded. However, when the test conditions are properly set up to model the surface temperature and shear stress in more complex heat transfer devices, the test results may predict what may occur in an operating heat exchanger of that design.
The test criteria established in this part of ISO 16784 are not intended to govern the type of bench and pilot scale testing normally carried out by water treatment companies as part of their proprietary product development programmes. However, water treatment companies may choose to use the
criteria in this part of ISO 16784 as guidelines in the development of their own product development test procedures.

This document specifies the principles, reagents and materials, test apparatus, test methods, evaluation of results and requirements for test reports using pilot test for industrial cooling water systems
This part of ISO 16784 describes a method for preliminary evaluation of the performance of treatment programmes for open recirculating cooling water systems. It is based primarily on laboratory testing but the heat exchanger testing facility can also be used for on-site evaluation. This part of ISO 16784
does not include heat exchangers with cooling water on the shell-side (i.e. external to the tubes).