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China's development of many oil and gas fields with high H2S corrosion caused by acidic oil and gas field facilities, among other factors, the hydrogen sulfide is the most dangerous, especially for sucker rod and other downhole equipment destructive very serious. According to the 2000 operating statistics analysis, Wenliu oilfield sucker rod appear the total number of questions the total annual the pump operations found that 76.3% of the total number of questions, and caused direct economic losses of more than 20 million yuan. , H2S corrosion and corrosion protection of steel a lot of research, studies show that: in the surface of the material traces of corrosion and corrosion products, often become the pilot of the failure process and accelerate the destruction of the factors. Accordingly, it is extremely important to reduce the corrosion of the equipment in the oilfield. Covered with a layer of anti-corrosion layer on the metal surface is a very effective improvement measures. The research group have been developed a variety of tungsten alloy substituting chromium plating, and has been widely used in the actual production. In order to study plated tungsten alloy coating resistant to H 2 S corrosion, sucker rod, this article selected 30CrMo material often used in the crude oil sucker rod as experimental objects tungsten alloy coating the 30CrMo sucker rod, and blank 30CrMo sucker rod resistance to H2S corrosion of a comparative study. Traditional plating process are based on the DC method the DC plating method has some deficiencies, such as changing a single parameter, plating system is unstable, electrodeposition coating is defective, etc., this people will think of the alternative DC plating means . The pulse plating plating method is a good, has a DC unmatched advantages. This article attempts to attempts plating tungsten alloy by pulse power, pulse plating process does not change the premise of the DC plating solution components, to find the best pulse plating process parameters, in order to be able to be used in the production practice. In this paper, to carry out the work of the following aspects: [1] This article is ripe the DC plating process conditions, four tungsten alloy, study their resistance to aqueous solution of saturated H 2 S eclipse. [2] through a variety of analytical methods, go through the the saturated H 2 S aqueous corrosion of sucker rod material analysis, by comparing the experimental proof of tungsten alloy coatings on the sucker rod material in H 2 S corrosion has some protection, which can be applied to oil production. [3] After a systematic study of various tungsten alloy coating corrosion resistance, come to the best tungsten alloy plating species, and detailed analysis of the corrosion mechanism, which provide a theoretical basis for oilfield production. [4] does not change the condition of the the DC plating solution components, pulse power plated tungsten alloy coating, and by comparison with the DC plating experiments to study the pulse parameters on the performance of the coating, to arrive at better than DC plating coating.
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