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Case histories show that non-visible contamination may result in rapid coating failure. Physical and chemical tests to detect same. Remediation measures. Reagents, materials, tools, procedures & results.
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Surface Preparation of Contaminated Steel Surfaces
Case histories indicate that non-visible contamination may result in rapid coating failure. Contaminants may be assumed to be presents on any steel surface. Even new steel may be contaminated at the origin or during transport or installation. Therefore, any steel surface to be coated requires cleaning followed by testing for non-visible contamination.
Non-visible contamination may be detected by allowing the just-cleaned surface to rust. If a uniform sandy rust results the surface may be free of Iron Salts and chlorides that would otherwise produce dark or black areas.
Other chemical and simple physical tests are also described and evaluated. Remediation of positive test results are discussed. Reagents, materials, tools, procedures and results are detailed.
The use of coatings in service environments where soluble salt contamination of the substrate is suspected. Detection, removal, and testing. Cost-to-benefit ratio.
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HISTORICAL DOCUMENT. Assessing corrosion in the field. New: long-range ultrasonic testing (UT), fiber optic strain gauges; high-resolution electrical resistance (ER), a new method of hydrogen probe monitoring, and extended-analysis coupons.
Corrosion associated with alternating current (AC) interference on buried steel pipelines. AC corrosion characteristics and proposed mechanisms. Approaches to protection and monitoring.